chore: import upstream snapshot with attribution

2026-07-13 12:59:56 +08:00
commit e93507a09c
2027 changed files with 674044 additions and 0 deletions
@@ -0,0 +1,69 @@
+# SPDX-License-Identifier: AGPL-3.0-only
+# Copyright 2026-present the Unsloth AI Inc. team. All rights reserved.
+
+# Runs installer parity and autostart opt-out tests on Windows and macOS.
+#
+# Why: that test is the guard that install.sh and install.ps1 stay in
+# sync, but today it only runs on ubuntu-latest (auto-discovered by
+# studio-backend-ci.yml's "Repo tests (CPU)" job). The test reads both
+# installer scripts, and on Windows Path.read_text() defaults to the
+# cp1252 locale encoding, so a non-cp1252 byte in install.sh (it already
+# contains a U+274C) raises UnicodeDecodeError there even though Linux and
+# macOS default to UTF-8. The reads were pinned to encoding="utf-8" in
+# #6166; this job keeps that from silently regressing by exercising the
+# test on the platforms it claims parity for. Pure pytest, no GPU,
+# sub-second, so the matrix is cheap.
+
+name: Cross-platform parity
+
+on:
+  pull_request:
+    paths:
+      - 'install.sh'
+      - 'install.ps1'
+      - 'tests/test_installer_skip_autostart.py'
+      - 'tests/python/test_cross_platform_parity.py'
+      - '.github/workflows/cross-platform-parity-ci.yml'
+  push:
+    branches: [main]
+    paths:
+      - 'install.sh'
+      - 'install.ps1'
+      - 'tests/test_installer_skip_autostart.py'
+      - 'tests/python/test_cross_platform_parity.py'
+      - '.github/workflows/cross-platform-parity-ci.yml'
+  workflow_dispatch:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+jobs:
+  parity:
+    name: parity (${{ matrix.os }})
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [windows-latest, macos-latest]
+    runs-on: ${{ matrix.os }}
+    timeout-minutes: 10
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
+      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
+        with:
+          python-version: '3.12'
+          cache: 'pip'
+      - run: python -m pip install -U pip pytest
+      - name: Cross-platform parity tests
+        env:
+          UNSLOTH_NO_TORCH: '1'
+        run: >-
+          python -m pytest
+          tests/python/test_cross_platform_parity.py
+          tests/test_installer_skip_autostart.py
+          -q
@@ -0,0 +1,379 @@
+# SPDX-License-Identifier: AGPL-3.0-only
+# Copyright 2026-present the Unsloth AI Inc. team. All rights reserved.
+
+# Whole-repo, multi-language source-lint gate. Runs on every PR
+# (no path filter) because each step is sub-second to a few seconds
+# and together they catch a class of breakage the focused build
+# workflows would miss:
+#
+#   - Python syntax + ruff + leftover debugger calls (across 350+
+#     committed .py files, not just studio/backend).
+#   - Shell `bash -n` parse for every committed *.sh.
+#   - `yaml.safe_load` and `json.loads` round-trip for every
+#     committed YAML / JSON config.
+#
+# TypeScript and Rust are NOT duplicated here on purpose:
+#   - Studio Frontend CI runs `npm run typecheck` (= `tsc --noEmit`)
+#     and `npm run build` (vite/swc) on every studio/frontend/**
+#     change, which is a full TS AST + type check.
+#   - Studio Tauri CI runs `tauri build --debug --no-bundle` on
+#     every studio/src-tauri/** or studio/frontend/** change, which
+#     compiles the Rust crate (= cargo check + cargo build).
+# Each is a stricter check than a parse-only step would be, so a
+# fast-fail duplicate here would only burn cache; the dedicated
+# workflows already block merges on Rust / TS regressions.
+
+name: Lint CI
+
+on:
+  pull_request:
+  push:
+    branches: [main, pip]
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+jobs:
+  source-lint:
+    name: Source lint (Python + shell + YAML + JSON + safety nets)
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
+
+      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
+        with:
+          python-version: '3.12'
+          cache: 'pip'
+
+      # Pin ruff to match .pre-commit-config.yaml so a CI-only ruff
+      # bump cannot disagree with what pre-commit accepted.
+      # codespell is pinned for the same reason: a reviewer should
+      # never see a typo report appear and disappear depending on
+      # which codespell version the runner happened to install.
+      - run: pip install 'ruff==0.15.12' 'pyyaml>=6' 'codespell>=2.3,<3'
+
+      - name: Linux deps for shellcheck
+        run: sudo apt-get update -qq && sudo apt-get install -y --no-install-recommends shellcheck
+
+      - name: Python AST/syntax check (every committed .py must compile)
+        # python -m compileall uses the same parser the interpreter
+        # uses, so anything broken here would also crash at
+        # `import X` on a user's machine. Sub-second across 350+
+        # files. Hard gate.
+        run: |
+          python -m compileall -q -j 0 \
+            unsloth unsloth_cli studio tests cli.py unsloth-cli.py
+
+      - name: Python ruff check (whole repo)
+        # The narrow rule set in pyproject.toml [tool.ruff.lint]
+        # selects E9 / F63 / F7 / F82 -- syntax errors, broken
+        # comparisons, undefined names. The whole repo passes today,
+        # so this is a hard gate.
+        run: |
+          ruff check unsloth unsloth_cli studio tests cli.py unsloth-cli.py
+
+      - name: Import-hoist verifier self-test
+        # scripts/verify_import_hoist.py is a scope-aware (LEGB) AST
+        # resolver that gates import-hoisting / alias-rename refactors
+        # against two bugs ruff and pyflakes both miss:
+        #   1. dangling alias  -- `from a import b as _b` hoisted to
+        #      `from a import b` but a leftover `_b` reference now
+        #      resolves to nothing (or to some other module-level `_b`).
+        #   2. rename clash    -- `_b -> b` silently re-points at a
+        #      different object already named `b` in that scope.
+        # This step runs the tool's 8 negative-control cases so a
+        # regression in the verifier itself fails before we trust it on
+        # a diff. Hermetic, stdlib-only, sub-second. Hard gate.
+        run: |
+          python scripts/verify_import_hoist.py --self-test
+
+      - name: Import-hoist / alias-rename safety (changed Python files)
+        # Runs the verifier in compare mode on every in-place-modified
+        # .py in the PR: parses each file BEFORE (base branch) and AFTER
+        # (this diff), resolves every name load, and fails on a BLOCKER
+        # (dangling alias / rename clash / re-pointed import). INFO
+        # findings (a helper relocated to another file) do not fail.
+        #
+        # --diff-filter=M (in-place edits only) is deliberate: that is
+        # exactly where a hoist refactor lives, and it skips brand-new
+        # files whose re-export imports would otherwise look "unused".
+        #
+        # Diff against the true merge-base, not the base tip. A two-dot
+        # diff against the tip re-lints every file the base branch
+        # changed after the PR branched, comparing newer base code
+        # (BEFORE) against the PR's older snapshot (AFTER) - a
+        # time-reversed comparison that flags the base branch's own
+        # refactors as blockers on PRs that never touched those files.
+        # The compare API returns the merge-base without needing local
+        # history, and fetching that single commit by SHA keeps the
+        # shallow (fetch-depth: 1) clone.
+        if: github.event_name == 'pull_request'
+        env:
+          GH_TOKEN: ${{ github.token }}
+        run: |
+          MERGE_BASE=$(gh api \
+            "repos/${{ github.repository }}/compare/${{ github.event.pull_request.base.sha }}...${{ github.event.pull_request.head.sha }}" \
+            --jq .merge_base_commit.sha)
+          git fetch --no-tags --depth=1 origin "$MERGE_BASE"
+          mapfile -t CHANGED < <(
+            git diff --name-only --diff-filter=M \
+              "$MERGE_BASE" HEAD -- '*.py' \
+              | grep -vE '(^|/)(unsloth_compiled_cache|node_modules|build|dist)/' || true
+          )
+          if [ "${#CHANGED[@]}" -eq 0 ]; then
+            echo "no in-place-modified Python files to check"
+            exit 0
+          fi
+          printf 'merge base: %s\n' "$MERGE_BASE"
+          printf 'checking %d file(s):\n' "${#CHANGED[@]}"
+          printf '  %s\n' "${CHANGED[@]}"
+          python scripts/verify_import_hoist.py \
+            --before "$MERGE_BASE" --after HEAD "${CHANGED[@]}"
+
+      - name: No leftover debugger / pdb / breakpoint calls
+        # Catches the "I'll just stick a breakpoint() here" mistake
+        # before it ships. AST-based so commented-out debugger
+        # markers don't false-positive (a bare grep would; there
+        # are three commented `# breakpoint()` markers in
+        # unsloth/models/rl* today). Sub-second.
+        run: |
+          python <<'PY'
+          import ast, pathlib, sys
+
+          SKIP_PARTS = {".venv", "venv", "build", "dist", ".git",
+                        "unsloth_compiled_cache", "node_modules",
+                        "unsloth.egg-info"}
+
+          bad = []
+          scanned = 0
+          for path in sorted(pathlib.Path(".").rglob("*.py")):
+              if any(part in SKIP_PARTS for part in path.parts):
+                  continue
+              scanned += 1
+              try:
+                  tree = ast.parse(path.read_text(encoding="utf-8", errors="replace"))
+              except SyntaxError:
+                  continue   # compileall step above already failed this
+              for node in ast.walk(tree):
+                  if not isinstance(node, ast.Call):
+                      continue
+                  fn = node.func
+                  if isinstance(fn, ast.Name) and fn.id == "breakpoint":
+                      bad.append((path, node.lineno, "breakpoint()"))
+                  elif (isinstance(fn, ast.Attribute) and fn.attr == "set_trace"
+                        and isinstance(fn.value, ast.Name)
+                        and fn.value.id in {"pdb", "ipdb"}):
+                      bad.append((path, node.lineno, f"{fn.value.id}.set_trace()"))
+
+          if bad:
+              for path, lineno, what in bad:
+                  print(f"::error file={path},line={lineno}::leftover {what} -- remove before merging")
+              sys.exit(1)
+          print(f"no leftover debugger calls (scanned {scanned} files)")
+          PY
+
+      - name: License-header drift (informational; whole repo)
+        # Three header families are accepted across the repo:
+        #   1. SPDX one-liner: `# SPDX-License-Identifier: ...`
+        #      Used across studio/ (AGPL-3.0-only) and a few new
+        #      files elsewhere.
+        #   2. Apache-2.0 long form, marker phrase
+        #      "Licensed under the Apache License". Used across
+        #      unsloth/ and unsloth_cli/.
+        #   3. GNU long form, marker phrase "General Public License".
+        #      That single substring covers GPL, LGPL ("GNU Lesser
+        #      General Public License") and AGPL ("GNU Affero
+        #      General Public License") preambles, all three of
+        #      which appear in unsloth/kernels/* (LGPL/AGPL) without
+        #      the SPDX line.
+        # Empty files (mainly empty __init__.py) are skipped.
+        # Surfaced as a warning; cleaning up the actual misses is a
+        # follow-up PR, not a CI fix.
+        continue-on-error: true
+        run: |
+          python <<'PY'
+          import pathlib
+
+          ACCEPTED = (
+              "SPDX-License-Identifier",        # any SPDX line
+              "Licensed under the Apache License",  # Apache-2.0 long form
+              "General Public License",         # GPL / LGPL / AGPL long form
+          )
+          SKIP_PARTS = {".venv", "venv", "build", "dist", ".git",
+                        "unsloth_compiled_cache", "node_modules",
+                        "unsloth.egg-info"}
+
+          studio_missing = []
+          other_missing  = []
+          for path in sorted(pathlib.Path(".").rglob("*.py")):
+              if any(part in SKIP_PARTS for part in path.parts):
+                  continue
+              text = path.read_text(encoding="utf-8", errors="replace")
+              if not text.strip():
+                  continue  # empty __init__.py etc.
+              head = "\n".join(text.splitlines()[:25])
+              if any(marker in head for marker in ACCEPTED):
+                  continue
+              if "studio" in path.parts:
+                  studio_missing.append(path)
+              else:
+                  other_missing.append(path)
+
+          total = len(studio_missing) + len(other_missing)
+          if total == 0:
+              print("every committed .py has a recognised license header")
+          else:
+              print(f"::warning::{total} Python files have no recognised license "
+                    f"header (SPDX / Apache-2.0 / GNU long form): "
+                    f"studio={len(studio_missing)}, other={len(other_missing)}")
+              for path in (studio_missing + other_missing)[:30]:
+                  print(f"  {path}")
+              if total > 30:
+                  print(f"  ... and {total - 30} more")
+          PY
+
+      - name: Shell scripts parse cleanly (`bash -n`)
+        # Same idea as Python's compileall: parse-only check that
+        # every committed *.sh would not blow up at `bash script.sh`
+        # invocation time on a release box. tests/sh/ is the largest
+        # cluster (the install.sh shape tests).
+        run: |
+          shopt -s globstar
+          fail=0
+          for f in $(git ls-files '*.sh'); do
+              if ! bash -n "$f"; then
+                  echo "::error file=$f::shell parse error"
+                  fail=1
+              fi
+          done
+          if [ "$fail" -ne 0 ]; then
+              exit 1
+          fi
+          n=$(git ls-files '*.sh' | wc -l)
+          echo "$n shell scripts parse cleanly"
+
+      - name: YAML files parse cleanly (yaml.safe_load)
+        # Catches truncated workflow files, broken indents in
+        # dependabot.yml / pre-commit configs, etc. Includes
+        # .github/workflows/*.yml so a typo in the file we just
+        # added shows up immediately.
+        run: |
+          python <<'PY'
+          import pathlib, sys, yaml
+
+          SKIP_PARTS = {".venv", "venv", "build", "dist", ".git",
+                        "node_modules", "unsloth_compiled_cache",
+                        "unsloth.egg-info"}
+
+          bad = []
+          scanned = 0
+          for path in sorted(list(pathlib.Path(".").rglob("*.yml"))
+                             + list(pathlib.Path(".").rglob("*.yaml"))):
+              if any(part in SKIP_PARTS for part in path.parts):
+                  continue
+              scanned += 1
+              try:
+                  with path.open("r", encoding="utf-8") as fh:
+                      list(yaml.safe_load_all(fh))
+              except Exception as exc:
+                  bad.append((path, exc))
+
+          if bad:
+              for path, exc in bad:
+                  print(f"::error file={path}::YAML parse failed: {exc}")
+              sys.exit(1)
+          print(f"{scanned} YAML files parse cleanly")
+          PY
+
+      - name: JSON files parse cleanly (json.loads)
+        # Catches malformed package.json, biome.json, etc. Skips:
+        #   - huge npm/bun lockfiles (machine-generated, slow to
+        #     parse, no value).
+        #   - tsconfig*.json: TypeScript convention is JSONC (JSON
+        #     with `/* ... */` comments), which standard json.loads
+        #     rejects. Strip-and-validate would need json5 or a
+        #     hand-rolled comment scrubber for marginal value, since
+        #     `tsc --noEmit` already validates these in Frontend CI.
+        run: |
+          python <<'PY'
+          import fnmatch, json, pathlib, sys
+
+          SKIP_PARTS = {".venv", "venv", "build", "dist", ".git",
+                        "node_modules", "unsloth_compiled_cache",
+                        "unsloth.egg-info"}
+          SKIP_NAMES = {"package-lock.json", "bun.lock"}
+          SKIP_PATTERNS = ("tsconfig*.json",)
+
+          bad = []
+          scanned = 0
+          for path in sorted(pathlib.Path(".").rglob("*.json")):
+              if any(part in SKIP_PARTS for part in path.parts):
+                  continue
+              if path.name in SKIP_NAMES:
+                  continue
+              if any(fnmatch.fnmatch(path.name, pat) for pat in SKIP_PATTERNS):
+                  continue
+              scanned += 1
+              try:
+                  json.loads(path.read_text(encoding="utf-8"))
+              except Exception as exc:
+                  bad.append((path, exc))
+
+          if bad:
+              for path, exc in bad:
+                  print(f"::error file={path}::JSON parse failed: {exc}")
+              sys.exit(1)
+          print(f"{scanned} JSON files parse cleanly")
+          PY
+
+      - name: codespell typo check (informational)
+        # Catches typos in code, comments, and docs across the repo.
+        # Skips lockfiles, generated assets, binary artefacts, and
+        # the LICENSE files (US/UK spelling drift in legal text is
+        # not ours to second-guess). The ignore-words-list pulls
+        # out short identifiers + valid technical terms that
+        # codespell's default dictionary would otherwise flag
+        # (e.g. `ans` as a math-quiz variable name in
+        # tests/utils/aime_eval.py, `parm`/`parms` in PyTorch
+        # nn.Module idioms). Non-blocking until the surfaced typos
+        # are fixed; drop continue-on-error after the cleanup.
+        continue-on-error: true
+        run: |
+          codespell \
+            --skip='*.lock,*.lockb,*.json,*.svg,*.png,*.jpg,*.jpeg,*.gif,*.ico,*.woff*,*.ttf,*.eot,*.zip,*.gz,*.gguf,*.safetensors,*.bin,node_modules,.git,build,dist,unsloth_compiled_cache,unsloth.egg-info,target,studio/frontend/dist,*.pyc,*-licenses.txt,LICENSE*' \
+            --ignore-words-list='ans,bu,hel,fo,te,ot,hist,ned,sav,recurser,datas,nin,parm,parms,checkin,nd,fr,inout,donot,uint' \
+            --quiet-level=2
+
+      - name: shellcheck on committed *.sh (informational)
+        # Goes beyond `bash -n` (which only parses): catches subtle
+        # shell bugs like unquoted variable expansions, useless
+        # `cat`, command substitutions inside `[[`, etc. The
+        # install/setup scripts are critical-path so the signal is
+        # worth surfacing. Non-blocking until install.sh's
+        # hand-rolled patterns get cleaned up; drop continue-on-error
+        # afterwards.
+        continue-on-error: true
+        run: |
+          # Exclude SC1090 ("source not followable") -- legitimate
+          # for installer scripts that source files at runtime
+          # paths shellcheck cannot resolve statically.
+          # SC2034 ("variable assigned but never used") fires on
+          # the export-only assignment idiom we use in install.sh.
+          shellcheck -e SC1090,SC2034 $(git ls-files '*.sh')
+
+      - name: ruff format drift (informational)
+        # The canonical formatter is scripts/run_ruff_format.py
+        # = ruff format + scripts/enforce_kwargs_spacing.py, so plain
+        # `ruff format --check` reports the kwarg-spacing diff as
+        # drift. Surface the count for visibility but keep
+        # non-blocking until the custom pipeline is wired in here.
+        continue-on-error: true
+        run: |
+          ruff format --check unsloth unsloth_cli studio tests cli.py unsloth-cli.py
@@ -0,0 +1,787 @@
+# SPDX-License-Identifier: AGPL-3.0-only
+# Copyright 2026-present the Unsloth AI Inc. team. All rights reserved.
+
+# Local Agent Guides CI
+# =====================
+# Detects when our local-agent setup recipes drift out of sync with
+# `unsloth run`. Boots a real `unsloth run --disable-tools` server and
+# drives the coding agents end to end through the *exact* recipes defined
+# in unsloth_cli/commands/start.py (the in-repo source of truth -- there
+# is no docs/ tree). Wherever start.py has a recipe we drive the agent
+# via `unsloth start <agent> --no-launch` and execute what it prints, so
+# the test self-updates against start.py and catches silent recipe drift.
+#
+# Source-of-truth files this workflow guards:
+#   unsloth_cli/commands/start.py   the `unsloth start <agent>` recipes
+#   unsloth_cli/commands/studio.py    the `unsloth run` banner (API Key line)
+#
+# Failure taxonomy (each surfaced with a distinct ::error:: + the agent name
+# + the start.py location, so a red X is immediately triageable):
+#   (a) Unsloth server/API regression -- the dialect HTTP preflight fails
+#       BEFORE the agent runs (or the server never becomes healthy).
+#   (b) Agent package install failed   -- npm/curl install of the CLI failed.
+#   (c) Guide drift                    -- preflight passed + install ok, but
+#       the documented `unsloth start` flow produced no/garbled output.
+#
+# Agents covered (6): claude, codex, hermes, openclaw, opencode, pi.
+#   - All six have a `unsloth start <agent>` recipe, so each cell obtains its
+#     env + command from `unsloth start <agent> --no-launch` and runs THAT
+#     (self-updating: a recipe change is exercised automatically).
+
+name: Local Agent Guides CI
+
+on:
+  # Off-peak weekly, deliberately a NON-:00 minute to dodge the top-of-hour
+  # GitHub-hosted-runner stampede.
+  schedule:
+    - cron: '37 7 * * 1'
+  workflow_dispatch:
+  pull_request:
+    paths:
+      - 'unsloth_cli/**'
+      - 'studio/backend/routes/**'
+      # Contracts this workflow asserts that live outside routes/**: the
+      # /api/health endpoint, the llama-server KV-cache log behavior, and the
+      # request/response schemas the agent dialects depend on.
+      - 'studio/backend/main.py'
+      - 'studio/backend/core/inference/llama_cpp.py'
+      - 'studio/backend/models/**'
+      - 'install.sh'
+      - '.github/workflows/local-agent-guides-ci.yml'
+      - '.github/scripts/serve-unsloth-run.sh'
+      - '.github/scripts/assert-prompt-cache.sh'
+      - '.github/scripts/agent-guides-install.sh'
+      - '.github/scripts/agent-guides-drive.sh'
+      - '.github/scripts/ci-connect-prompt.txt'
+      - '.github/scripts/ci-min-system-prompt.txt'
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+# Secret handling on pull_request: these jobs check out and run PR-controlled code
+# (install.sh, .github/scripts/**), so HF_TOKEN (an external HF credential) is gated
+# off pull_request at each step below -- public GGUF repos still download anonymously.
+# GH_TOKEN (GITHUB_TOKEN) is kept: it is the job-scoped contents:read token and
+# install_llama_prebuilt.py needs it for the GitHub releases API (else 403s).
+
+env:
+  # Determinism precedent (studio-inference-smoke.yml): temp 0 + fixed seed.
+  UNSLOTH_SEED: '3407'
+  # A single invoke must never hang the runner on a headless TTY prompt. With
+  # prefill-shrinking flags (minimal system prompt + restricted tools) a turn on
+  # a 4B model finishes in a couple of minutes on CPU; this also caps how long a
+  # still-large-prompt agent burns before failing. Well under the 6h job cap.
+  AGENT_INVOKE_TIMEOUT: '600'
+
+jobs:
+  # ═════════════════════════════════════════════════════════════════════
+  # Job 1: connection
+  #   Per-agent: serve gemma-3-270m, HTTP-preflight the agent's dialect,
+  #   install the agent, run `unsloth start <agent> --no-launch`, execute
+  #   the emitted recipe with a trivial prompt, assert a non-empty reply.
+  #   Runs on PR + weekly + dispatch. Each matrix cell is its own runner so
+  #   it serves exactly one model on its own port.
+  # ═════════════════════════════════════════════════════════════════════
+  connection:
+    name: connection (${{ matrix.agent }})
+    runs-on: ubuntu-latest
+    timeout-minutes: 40
+    strategy:
+      fail-fast: false
+      matrix:
+        agent: [claude, codex, hermes, openclaw, opencode, pi]
+        include:
+          # OpenClaw needs Node 24; everything else is happy on 22.
+          - agent: openclaw
+            node: '24'
+    env:
+      # gemma-4-E4B (128K context, capable enough to drive every agent for a
+      # trivial reply; the 270m model produced empty/failed responses for
+      # codex/openclaw). Hermes' 64K context floor no longer constrains the model
+      # choice: write_hermes_config claims the floor for smaller windows and
+      # scales compaction back to the real window. Served as a flat
+      # GGUF file (the -MTP- repo ships no separate draft, so this is plain 4B).
+      GGUF_REPO: unsloth/gemma-4-E4B-it-GGUF
+      GGUF_FILE: gemma-4-E4B-it-UD-Q4_K_XL.gguf
+      STUDIO_PORT: '18901'
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
+
+      - name: Linux deps for llama.cpp prebuilt
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y --no-install-recommends \
+            libcurl4-openssl-dev libssl-dev jq
+
+      - uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e  # v6.4.0
+        with:
+          node-version: ${{ matrix.node || '22' }}
+
+      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
+        with:
+          python-version: '3.12'
+          cache: 'pip'
+
+      - name: Restore GGUF model file
+        id: cache-gguf
+        uses: actions/cache/restore@27d5ce7f107fe9357f9df03efb73ab90386fccae  # v5.0.5
+        continue-on-error: true
+        with:
+          path: gguf-cache
+          key: ${{ runner.os }}-gguf-${{ env.GGUF_REPO }}-${{ env.GGUF_FILE }}-v1
+
+      - name: Download GGUF if cache miss
+        id: download-gguf
+        if: steps.cache-gguf.outputs.cache-hit != 'true' || steps.cache-gguf.outcome != 'success'
+        env:
+          # Gated off PR (see note above); public GGUF still downloads.
+          HF_TOKEN: ${{ github.event_name != 'pull_request' && secrets.HF_TOKEN || '' }}
+        run: |
+          python -m pip install --upgrade huggingface_hub
+          mkdir -p gguf-cache
+          bash .github/scripts/hf-download-with-retry.sh "$GGUF_REPO" "$GGUF_FILE" gguf-cache
+
+      - name: Save GGUF model file
+        if: always() && steps.download-gguf.outcome == 'success'
+        uses: actions/cache/save@27d5ce7f107fe9357f9df03efb73ab90386fccae  # v5.0.5
+        with:
+          path: gguf-cache
+          key: ${{ runner.os }}-gguf-${{ env.GGUF_REPO }}-${{ env.GGUF_FILE }}-v1
+
+      - name: Install Studio (--local, --no-torch)
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          # Gated off PR (see note above); public GGUF still downloads.
+          HF_TOKEN: ${{ github.event_name != 'pull_request' && secrets.HF_TOKEN || '' }}
+        run: |
+          mkdir -p logs
+          set -o pipefail
+          bash install.sh --local --no-torch 2>&1 | tee logs/install.log
+
+      # ── boot the server under test (factored helper) ──────────────────
+      - name: Serve unsloth run --disable-tools (gemma-4-E4B)
+        run: |
+          unsloth studio reset-password
+          bash .github/scripts/serve-unsloth-run.sh \
+            --gguf-file "$GITHUB_WORKSPACE/gguf-cache/${GGUF_FILE}" \
+            --port "$STUDIO_PORT" --log-dir logs \
+            --extra "--seed $UNSLOTH_SEED --temp 0" \
+            --health-timeout 900
+
+      # ── (a) server/API preflight: prove the dialect works BEFORE the agent ─
+      # Distinct error class. If this step fails it is a SERVER regression,
+      # not the agent's or the guide's fault, and the agent steps never run.
+      - name: Preflight the agent's API dialect (class-a isolation)
+        env:
+          AGENT: ${{ matrix.agent }}
+        run: |
+          set -uo pipefail
+          B="$UNSLOTH_BASE_URL"; K="$UNSLOTH_API_KEY"
+          preflight_fail() {
+            echo "::error::[server/API regression] agent=$AGENT: $* (preflight failed BEFORE install/connect; this is class (a), not guide drift). Endpoint contract lives in studio/backend/routes/**.";
+            exit 1
+          }
+          code=$(curl -s -o /tmp/pf.json -w '%{http_code}' "$B/v1/models" \
+            -H "Authorization: Bearer $K") || true
+          [ "$code" = "200" ] || preflight_fail "/v1/models returned HTTP $code"
+          case "$AGENT" in
+            claude)
+              # Anthropic Messages dialect.
+              code=$(curl -s -o /tmp/pf.json -w '%{http_code}' "$B/v1/messages" \
+                -H "Authorization: Bearer $K" -H 'content-type: application/json' \
+                --max-time 120 \
+                -d "{\"model\":\"$UNSLOTH_MODEL_ID\",\"max_tokens\":16,\"messages\":[{\"role\":\"user\",\"content\":\"Hi\"}]}") || true
+              [ "$code" = "200" ] || preflight_fail "/v1/messages returned HTTP $code"
+              ;;
+            codex)
+              # Codex always streams /v1/responses.
+              code=$(curl -s -o /tmp/pf.json -w '%{http_code}' "$B/v1/responses" \
+                -H "Authorization: Bearer $K" -H 'content-type: application/json' \
+                --max-time 120 \
+                -d "{\"model\":\"$UNSLOTH_MODEL_ID\",\"input\":\"Hi\",\"max_output_tokens\":16,\"stream\":true}") || true
+              [ "$code" = "200" ] || preflight_fail "/v1/responses returned HTTP $code"
+              ;;
+            *)
+              # OpenAI Chat Completions dialect (hermes/opencode/pi/openclaw).
+              # OpenClaw's start.py recipe writes an "openai-completions"
+              # provider (write_openclaw_config), so it uses this path, not
+              # /v1/messages.
+              code=$(curl -s -o /tmp/pf.json -w '%{http_code}' "$B/v1/chat/completions" \
+                -H "Authorization: Bearer $K" -H 'content-type: application/json' \
+                --max-time 120 \
+                -d "{\"model\":\"$UNSLOTH_MODEL_ID\",\"max_tokens\":16,\"messages\":[{\"role\":\"user\",\"content\":\"Hi\"}]}") || true
+              [ "$code" = "200" ] || preflight_fail "/v1/chat/completions returned HTTP $code"
+              ;;
+          esac
+          echo "preflight OK for $AGENT"
+
+      # ── (b) install the agent CLI (hardened npm/curl, retried) ─────────
+      - name: Install agent CLI (class-b isolation)
+        env:
+          AGENT: ${{ matrix.agent }}
+        run: bash .github/scripts/agent-guides-install.sh "$AGENT"
+
+      # ── (c) drive the agent via start.py and assert a reply ──────────
+      # For the 5 agents with a start.py recipe we run
+      # `unsloth start <agent> --no-launch`, eval its env/unset exports,
+      # then run the printed command with a hard timeout (no headless-TTY
+      # hang). Pi has no connect recipe, so it is driven by hand and the
+      # cell asserts that absence is the (known) reason.
+      - name: Drive ${{ matrix.agent }} via unsloth start (class-c isolation)
+        env:
+          AGENT: ${{ matrix.agent }}
+        run: bash .github/scripts/agent-guides-drive.sh connection "$AGENT"
+
+      - name: Collect server logs (debug)
+        if: always()
+        run: |
+          mkdir -p logs/studio-logs
+          cp -r "$HOME/.unsloth/studio/logs/." logs/studio-logs/ 2>/dev/null || true
+          # Redact the key across the WHOLE logs/ tree, not just studio-logs:
+          # serve-unsloth-run.sh records the `unsloth run` banner (which prints
+          # `API Key: <key>`) into logs/unsloth-run-<port>.log, and the upload
+          # step publishes all of logs/, so scrubbing only studio-logs would leak
+          # the bearer token in the retained artifact.
+          # Sweep EVERY uploaded path, not just logs/ -- redacted-configs/ and
+          # agent-workdir/ are published by the same upload step.
+          if [ -n "${UNSLOTH_API_KEY:-}" ]; then
+            grep -rlF "$UNSLOTH_API_KEY" logs redacted-configs agent-workdir 2>/dev/null | while IFS= read -r f; do
+              sed -i "s#${UNSLOTH_API_KEY}#<REDACTED>#g" "$f" 2>/dev/null || true
+            done
+          fi
+
+      - name: Stop Studio
+        if: always()
+        run: |
+          # Guard the PID: an unset/zero UNSLOTH_SERVER_PID would make
+          # `kill 0` signal this step's whole process group and abort cleanup.
+          if [ -n "${UNSLOTH_SERVER_PID:-}" ] && [ "${UNSLOTH_SERVER_PID}" != "0" ]; then
+            kill "${UNSLOTH_SERVER_PID}" 2>/dev/null || true
+          fi
+          sleep 2
+          ss -tln 2>/dev/null | grep ":${STUDIO_PORT}" || true
+
+      - name: Upload logs
+        if: always()
+        continue-on-error: true
+        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
+        with:
+          name: connection-${{ matrix.agent }}-log
+          path: |
+            logs/
+            redacted-configs/
+          retention-days: 7
+
+  # ═════════════════════════════════════════════════════════════════════
+  # Job 2: file-edit
+  #   The deterministic 2-turn hello.py test on Qwen3.5-4B (smaller models
+  #   can't reliably drive the heavyweight agents' edit flows). Weekly +
+  #   dispatch only -- it is the slow, model-heavy job and must not gate PRs.
+  # ═════════════════════════════════════════════════════════════════════
+  file-edit:
+    name: file-edit (${{ matrix.agent }})
+    if: github.event_name != 'pull_request'
+    runs-on: ubuntu-latest
+    timeout-minutes: 60
+    # hermes and openclaw drive a multi-turn tool loop that a CPU-only runner
+    # cannot finish in time (e.g. openclaw holds its 300s session-write-lock past
+    # expiry; each turn re-prefills the tool prompt at ~16 tok/s). Their endpoint
+    # wiring + generation are already hard-gated by the connection job, so the
+    # file-edit cell is best-effort here -- it still runs and uploads logs, but a
+    # timeout does not fail the workflow. Drop best_effort (or move e2e to a GPU
+    # runner) to make it blocking again.
+    continue-on-error: ${{ matrix.best_effort || false }}
+    strategy:
+      fail-fast: false
+      matrix:
+        agent: [claude, codex, hermes, openclaw, opencode, pi]
+        include:
+          - agent: openclaw
+            node: '24'
+            best_effort: true
+          - agent: hermes
+            best_effort: true
+    env:
+      # gemma-4-E4B served as a flat GGUF file (cache size tracks the .gguf 1:1,
+      # no xet-chunk inflation; the -MTP- repo ships no separate draft file).
+      GGUF_REPO: unsloth/gemma-4-E4B-it-GGUF
+      GGUF_FILE: gemma-4-E4B-it-UD-Q4_K_XL.gguf
+      STUDIO_PORT: '18902'
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
+
+      - name: Linux deps for llama.cpp prebuilt
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y --no-install-recommends \
+            libcurl4-openssl-dev libssl-dev jq
+
+      - uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e  # v6.4.0
+        with:
+          node-version: ${{ matrix.node || '22' }}
+
+      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
+        with:
+          python-version: '3.12'
+          cache: 'pip'
+
+      - name: Restore GGUF model file
+        id: cache-gguf
+        uses: actions/cache/restore@27d5ce7f107fe9357f9df03efb73ab90386fccae  # v5.0.5
+        continue-on-error: true
+        with:
+          path: gguf-cache
+          key: ${{ runner.os }}-gguf-${{ env.GGUF_REPO }}-${{ env.GGUF_FILE }}-v1
+
+      - name: Download GGUF if cache miss
+        id: download-gguf
+        if: steps.cache-gguf.outputs.cache-hit != 'true' || steps.cache-gguf.outcome != 'success'
+        env:
+          # Gated off PR (see note above); public GGUF still downloads.
+          HF_TOKEN: ${{ github.event_name != 'pull_request' && secrets.HF_TOKEN || '' }}
+        run: |
+          python -m pip install --upgrade huggingface_hub
+          mkdir -p gguf-cache
+          bash .github/scripts/hf-download-with-retry.sh "$GGUF_REPO" "$GGUF_FILE" gguf-cache
+
+      - name: Save GGUF model file
+        if: always() && steps.download-gguf.outcome == 'success'
+        uses: actions/cache/save@27d5ce7f107fe9357f9df03efb73ab90386fccae  # v5.0.5
+        with:
+          path: gguf-cache
+          key: ${{ runner.os }}-gguf-${{ env.GGUF_REPO }}-${{ env.GGUF_FILE }}-v1
+
+      - name: Install Studio (--local, --no-torch)
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          # Gated off PR (see note above); public GGUF still downloads.
+          HF_TOKEN: ${{ github.event_name != 'pull_request' && secrets.HF_TOKEN || '' }}
+        run: |
+          mkdir -p logs
+          set -o pipefail
+          bash install.sh --local --no-torch 2>&1 | tee logs/install.log
+
+      - name: Serve unsloth run --disable-tools (gemma-4-E4B)
+        run: |
+          unsloth studio reset-password
+          bash .github/scripts/serve-unsloth-run.sh \
+            --gguf-file "$GITHUB_WORKSPACE/gguf-cache/${GGUF_FILE}" \
+            --port "$STUDIO_PORT" --log-dir logs \
+            --extra "--seed $UNSLOTH_SEED --temp 0" \
+            --health-timeout 900
+
+      - name: Preflight the agent's API dialect (class-a isolation)
+        env:
+          AGENT: ${{ matrix.agent }}
+        run: |
+          set -uo pipefail
+          B="$UNSLOTH_BASE_URL"; K="$UNSLOTH_API_KEY"
+          preflight_fail() {
+            echo "::error::[server/API regression] agent=$AGENT: $* (preflight failed BEFORE install/connect; this is class (a), not guide drift). Endpoint contract lives in studio/backend/routes/**.";
+            exit 1
+          }
+          code=$(curl -s -o /tmp/pf.json -w '%{http_code}' "$B/v1/models" \
+            -H "Authorization: Bearer $K") || true
+          [ "$code" = "200" ] || preflight_fail "/v1/models returned HTTP $code"
+          # Probe the same dialect the agent will use, so a streaming/messages
+          # regression in the weekly run is reported as class (a) here instead of
+          # surfacing later as guide drift (mirrors the connection job).
+          case "$AGENT" in
+            claude)
+              code=$(curl -s -o /tmp/pf.json -w '%{http_code}' "$B/v1/messages" \
+                -H "Authorization: Bearer $K" -H 'content-type: application/json' \
+                --max-time 120 \
+                -d "{\"model\":\"$UNSLOTH_MODEL_ID\",\"max_tokens\":16,\"messages\":[{\"role\":\"user\",\"content\":\"Hi\"}]}") || true
+              [ "$code" = "200" ] || preflight_fail "/v1/messages returned HTTP $code"
+              ;;
+            codex)
+              code=$(curl -s -o /tmp/pf.json -w '%{http_code}' "$B/v1/responses" \
+                -H "Authorization: Bearer $K" -H 'content-type: application/json' \
+                --max-time 120 \
+                -d "{\"model\":\"$UNSLOTH_MODEL_ID\",\"input\":\"Hi\",\"max_output_tokens\":16,\"stream\":true}") || true
+              [ "$code" = "200" ] || preflight_fail "/v1/responses returned HTTP $code"
+              ;;
+            *)
+              # OpenAI Chat Completions dialect (hermes/opencode/pi/openclaw).
+              code=$(curl -s -o /tmp/pf.json -w '%{http_code}' "$B/v1/chat/completions" \
+                -H "Authorization: Bearer $K" -H 'content-type: application/json' \
+                --max-time 120 \
+                -d "{\"model\":\"$UNSLOTH_MODEL_ID\",\"max_tokens\":16,\"messages\":[{\"role\":\"user\",\"content\":\"Hi\"}]}") || true
+              [ "$code" = "200" ] || preflight_fail "/v1/chat/completions returned HTTP $code"
+              ;;
+          esac
+          echo "preflight OK for $AGENT"
+
+      - name: Install agent CLI (class-b isolation)
+        env:
+          AGENT: ${{ matrix.agent }}
+        run: bash .github/scripts/agent-guides-install.sh "$AGENT"
+
+      - name: 2-turn hello.py test (class-c isolation)
+        env:
+          AGENT: ${{ matrix.agent }}
+        run: bash .github/scripts/agent-guides-drive.sh file-edit "$AGENT"
+
+      - name: Collect server logs (debug)
+        if: always()
+        run: |
+          mkdir -p logs/studio-logs
+          cp -r "$HOME/.unsloth/studio/logs/." logs/studio-logs/ 2>/dev/null || true
+          # Redact the key across the WHOLE logs/ tree, not just studio-logs:
+          # serve-unsloth-run.sh records the `unsloth run` banner (which prints
+          # `API Key: <key>`) into logs/unsloth-run-<port>.log, and the upload
+          # step publishes all of logs/, so scrubbing only studio-logs would leak
+          # the bearer token in the retained artifact.
+          # Sweep EVERY uploaded path, not just logs/ -- redacted-configs/ and
+          # agent-workdir/ are published by the same upload step.
+          if [ -n "${UNSLOTH_API_KEY:-}" ]; then
+            grep -rlF "$UNSLOTH_API_KEY" logs redacted-configs agent-workdir 2>/dev/null | while IFS= read -r f; do
+              sed -i "s#${UNSLOTH_API_KEY}#<REDACTED>#g" "$f" 2>/dev/null || true
+            done
+          fi
+
+      - name: Stop Studio
+        if: always()
+        run: |
+          # Guard the PID: an unset/zero UNSLOTH_SERVER_PID would make
+          # `kill 0` signal this step's whole process group and abort cleanup.
+          if [ -n "${UNSLOTH_SERVER_PID:-}" ] && [ "${UNSLOTH_SERVER_PID}" != "0" ]; then
+            kill "${UNSLOTH_SERVER_PID}" 2>/dev/null || true
+          fi
+          sleep 2
+          ss -tln 2>/dev/null | grep ":${STUDIO_PORT}" || true
+
+      - name: Upload logs
+        if: always()
+        continue-on-error: true
+        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
+        with:
+          name: file-edit-${{ matrix.agent }}-log
+          path: |
+            logs/
+            agent-workdir/
+            redacted-configs/
+          retention-days: 7
+
+  # ═════════════════════════════════════════════════════════════════════
+  # Job: resume
+  #   Does a conversation started with `unsloth start <agent>` survive exit
+  #   and resume? This drives the REAL launch path (not the --no-launch
+  #   recipe the other jobs use). A plain launch relocates the agent home to
+  #   a temp dir wiped on exit, so codex/pi cannot resume; --persist routes the
+  #   session to the stable Unsloth agents dir so it persists. opencode/claude
+  #   keep their session data in a fixed user dir, so they persist either way.
+  #   Dispatch-only: it is an end-to-end experiment, not a PR gate.
+  # ═════════════════════════════════════════════════════════════════════
+  resume:
+    name: resume (${{ matrix.agent }})
+    if: github.event_name == 'workflow_dispatch'
+    runs-on: ubuntu-latest
+    timeout-minutes: 60
+    strategy:
+      fail-fast: false
+      matrix:
+        # codex/pi relocate their whole home (resume broken without --persist);
+        # opencode/claude keep session data in a fixed dir (resume already works).
+        # One agent from each class proves the split end to end; openclaw/hermes
+        # share codex's relocation mechanism and are covered by the unit tests.
+        agent: [codex, opencode, claude, pi]
+    env:
+      GGUF_REPO: unsloth/gemma-4-E4B-it-GGUF
+      GGUF_FILE: gemma-4-E4B-it-UD-Q4_K_XL.gguf
+      STUDIO_PORT: '18904'
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
+
+      - name: Linux deps for llama.cpp prebuilt
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y --no-install-recommends \
+            libcurl4-openssl-dev libssl-dev jq
+
+      - uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e  # v6.4.0
+        with:
+          node-version: '22'
+
+      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
+        with:
+          python-version: '3.12'
+          cache: 'pip'
+
+      - name: Restore GGUF model file
+        id: cache-gguf
+        uses: actions/cache/restore@27d5ce7f107fe9357f9df03efb73ab90386fccae  # v5.0.5
+        continue-on-error: true
+        with:
+          path: gguf-cache
+          key: ${{ runner.os }}-gguf-${{ env.GGUF_REPO }}-${{ env.GGUF_FILE }}-v1
+
+      - name: Download GGUF if cache miss
+        id: download-gguf
+        if: steps.cache-gguf.outputs.cache-hit != 'true' || steps.cache-gguf.outcome != 'success'
+        env:
+          HF_TOKEN: ${{ secrets.HF_TOKEN }}
+        run: |
+          python -m pip install --upgrade huggingface_hub
+          mkdir -p gguf-cache
+          bash .github/scripts/hf-download-with-retry.sh "$GGUF_REPO" "$GGUF_FILE" gguf-cache
+
+      - name: Save GGUF model file
+        if: always() && steps.download-gguf.outcome == 'success'
+        uses: actions/cache/save@27d5ce7f107fe9357f9df03efb73ab90386fccae  # v5.0.5
+        with:
+          path: gguf-cache
+          key: ${{ runner.os }}-gguf-${{ env.GGUF_REPO }}-${{ env.GGUF_FILE }}-v1
+
+      - name: Install Studio (--local, --no-torch)
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          HF_TOKEN: ${{ secrets.HF_TOKEN }}
+        run: |
+          mkdir -p logs
+          set -o pipefail
+          bash install.sh --local --no-torch 2>&1 | tee logs/install.log
+
+      - name: Serve unsloth run --disable-tools (gemma-4-E4B)
+        run: |
+          unsloth studio reset-password
+          bash .github/scripts/serve-unsloth-run.sh \
+            --gguf-file "$GITHUB_WORKSPACE/gguf-cache/${GGUF_FILE}" \
+            --port "$STUDIO_PORT" --log-dir logs \
+            --extra "--seed $UNSLOTH_SEED --temp 0" \
+            --health-timeout 900
+
+      - name: Preflight the agent's API dialect (class-a isolation)
+        env:
+          AGENT: ${{ matrix.agent }}
+        run: |
+          set -uo pipefail
+          B="$UNSLOTH_BASE_URL"; K="$UNSLOTH_API_KEY"
+          preflight_fail() {
+            echo "::error::[server/API regression] agent=$AGENT: $* (preflight failed BEFORE install/connect). Endpoint contract lives in studio/backend/routes/**.";
+            exit 1
+          }
+          code=$(curl -s -o /tmp/pf.json -w '%{http_code}' "$B/v1/models" \
+            -H "Authorization: Bearer $K") || true
+          [ "$code" = "200" ] || preflight_fail "/v1/models returned HTTP $code"
+          case "$AGENT" in
+            claude)
+              code=$(curl -s -o /tmp/pf.json -w '%{http_code}' "$B/v1/messages" \
+                -H "Authorization: Bearer $K" -H 'content-type: application/json' \
+                --max-time 120 \
+                -d "{\"model\":\"$UNSLOTH_MODEL_ID\",\"max_tokens\":16,\"messages\":[{\"role\":\"user\",\"content\":\"Hi\"}]}") || true
+              [ "$code" = "200" ] || preflight_fail "/v1/messages returned HTTP $code"
+              ;;
+            codex)
+              code=$(curl -s -o /tmp/pf.json -w '%{http_code}' "$B/v1/responses" \
+                -H "Authorization: Bearer $K" -H 'content-type: application/json' \
+                --max-time 120 \
+                -d "{\"model\":\"$UNSLOTH_MODEL_ID\",\"input\":\"Hi\",\"max_output_tokens\":16,\"stream\":true}") || true
+              [ "$code" = "200" ] || preflight_fail "/v1/responses returned HTTP $code"
+              ;;
+            *)
+              code=$(curl -s -o /tmp/pf.json -w '%{http_code}' "$B/v1/chat/completions" \
+                -H "Authorization: Bearer $K" -H 'content-type: application/json' \
+                --max-time 120 \
+                -d "{\"model\":\"$UNSLOTH_MODEL_ID\",\"max_tokens\":16,\"messages\":[{\"role\":\"user\",\"content\":\"Hi\"}]}") || true
+              [ "$code" = "200" ] || preflight_fail "/v1/chat/completions returned HTTP $code"
+              ;;
+          esac
+          echo "preflight OK for $AGENT"
+
+      - name: Install agent CLI (class-b isolation)
+        env:
+          AGENT: ${{ matrix.agent }}
+        run: bash .github/scripts/agent-guides-install.sh "$AGENT"
+
+      - name: Resume experiment (launch path)
+        env:
+          AGENT: ${{ matrix.agent }}
+        run: bash .github/scripts/agent-guides-drive.sh resume "$AGENT"
+
+      - name: Collect server logs (debug)
+        if: always()
+        run: |
+          mkdir -p logs/studio-logs
+          cp -r "$HOME/.unsloth/studio/logs/." logs/studio-logs/ 2>/dev/null || true
+          if [ -n "${UNSLOTH_API_KEY:-}" ]; then
+            grep -rlF "$UNSLOTH_API_KEY" logs redacted-configs agent-workdir 2>/dev/null | while IFS= read -r f; do
+              sed -i "s#${UNSLOTH_API_KEY}#<REDACTED>#g" "$f" 2>/dev/null || true
+            done
+          fi
+
+      - name: Stop Studio
+        if: always()
+        run: |
+          if [ -n "${UNSLOTH_SERVER_PID:-}" ] && [ "${UNSLOTH_SERVER_PID}" != "0" ]; then
+            kill "${UNSLOTH_SERVER_PID}" 2>/dev/null || true
+          fi
+          sleep 2
+          ss -tln 2>/dev/null | grep ":${STUDIO_PORT}" || true
+
+      - name: Upload logs
+        if: always()
+        continue-on-error: true
+        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
+        with:
+          name: resume-${{ matrix.agent }}-log
+          path: |
+            logs/
+            agent-workdir/
+            redacted-configs/
+          retention-days: 7
+
+  # ═════════════════════════════════════════════════════════════════════
+  # Job 3: prompt-cache
+  #   (a) curl 2-turn /v1/chat/completions: assert turn-2 cached_tokens > 0
+  #       (server prompt-cache sanity).
+  #   (b) Claude Code attribution A/B: with CLAUDE_CODE_ATTRIBUTION_HEADER=0
+  #       expect a llama-server KV-cache HIT on turn 2; without it expect a
+  #       MISS. If it inverts, the guide flag is stale.
+  #   PR + weekly + dispatch (cheap, gemma-3-270m).
+  # ═════════════════════════════════════════════════════════════════════
+  prompt-cache:
+    name: prompt-cache (gemma-3-270m)
+    runs-on: ubuntu-latest
+    timeout-minutes: 25
+    env:
+      GGUF_REPO: unsloth/gemma-3-270m-it-GGUF
+      GGUF_VARIANT: UD-Q4_K_XL
+      GGUF_FILE: gemma-3-270m-it-UD-Q4_K_XL.gguf
+      STUDIO_PORT: '18903'
+      HF_HOME: ${{ github.workspace }}/hf-cache
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
+
+      - name: Linux deps for llama.cpp prebuilt
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y --no-install-recommends \
+            libcurl4-openssl-dev libssl-dev jq
+
+      - uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e  # v6.4.0
+        with:
+          node-version: '22'
+
+      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
+        with:
+          python-version: '3.12'
+          cache: 'pip'
+
+      - name: Restore HF_HOME for ${{ env.GGUF_REPO }}
+        id: cache-hf
+        uses: actions/cache/restore@27d5ce7f107fe9357f9df03efb73ab90386fccae  # v5.0.5
+        continue-on-error: true
+        with:
+          path: hf-cache
+          key: ${{ runner.os }}-hf-${{ env.GGUF_REPO }}-${{ env.GGUF_VARIANT }}-v2
+
+      - name: Prime HF_HOME with the GGUF
+        id: prime-hf
+        if: steps.cache-hf.outputs.cache-hit != 'true' || steps.cache-hf.outcome != 'success'
+        env:
+          # Gated off PR (see note above); public GGUF still downloads.
+          HF_TOKEN: ${{ github.event_name != 'pull_request' && secrets.HF_TOKEN || '' }}
+        run: |
+          python -m pip install --upgrade huggingface_hub
+          mkdir -p hf-cache
+          bash .github/scripts/hf-download-with-retry.sh "$GGUF_REPO" "$GGUF_FILE"
+
+      - name: Save HF_HOME for ${{ env.GGUF_REPO }}
+        if: always() && steps.prime-hf.outcome == 'success'
+        uses: actions/cache/save@27d5ce7f107fe9357f9df03efb73ab90386fccae  # v5.0.5
+        with:
+          path: hf-cache
+          key: ${{ runner.os }}-hf-${{ env.GGUF_REPO }}-${{ env.GGUF_VARIANT }}-v2
+
+      - name: Install Studio (--local, --no-torch)
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          # Gated off PR (see note above); public GGUF still downloads.
+          HF_TOKEN: ${{ github.event_name != 'pull_request' && secrets.HF_TOKEN || '' }}
+        run: |
+          mkdir -p logs
+          set -o pipefail
+          bash install.sh --local --no-torch 2>&1 | tee logs/install.log
+
+      - name: Serve unsloth run --disable-tools (gemma-3-270m)
+        run: |
+          unsloth studio reset-password
+          bash .github/scripts/serve-unsloth-run.sh \
+            --model "$GGUF_REPO" --gguf-variant "$GGUF_VARIANT" \
+            --port "$STUDIO_PORT" --log-dir logs \
+            --extra "--seed $UNSLOTH_SEED --temp 0"
+
+      # (a) server prompt-cache sanity on the OpenAI chat path. The helper runs
+      # the 2-turn probe internally (turn 2 reuses turn 1's prefix) and asserts
+      # turn-2 usage.prompt_tokens_details.cached_tokens > 0. This is the hard
+      # gate -- it proves llama.cpp KV reuse is surfaced on /v1/chat/completions.
+      - name: Server prompt-cache sanity (cached_tokens > 0)
+        run: bash .github/scripts/assert-prompt-cache.sh api "$UNSLOTH_BASE_URL" "$UNSLOTH_API_KEY"
+
+      - name: Install Claude Code (class-b isolation)
+        env:
+          AGENT: claude
+        run: bash .github/scripts/agent-guides-install.sh claude
+
+      # (b) Claude attribution A/B against the llama-server log. This is the most
+      # environment-sensitive check (it depends on the bundled llama.cpp's
+      # slot-reuse log wording and on claude --continue reusing the prefix), so
+      # it is non-blocking until calibrated on the first scheduled run; the
+      # server cache sanity above is the hard gate. The step still prints the
+      # observed HIT/MISS so drift is visible in the log + artifacts.
+      - name: Claude attribution A/B (HIT with header=0, MISS without)
+        continue-on-error: true
+        run: bash .github/scripts/agent-guides-drive.sh attribution-ab claude
+
+      - name: Collect server logs (debug)
+        if: always()
+        run: |
+          mkdir -p logs/studio-logs
+          cp -r "$HOME/.unsloth/studio/logs/." logs/studio-logs/ 2>/dev/null || true
+          # Redact the key across the WHOLE logs/ tree, not just studio-logs:
+          # serve-unsloth-run.sh records the `unsloth run` banner (which prints
+          # `API Key: <key>`) into logs/unsloth-run-<port>.log, and the upload
+          # step publishes all of logs/, so scrubbing only studio-logs would leak
+          # the bearer token in the retained artifact.
+          # Sweep EVERY uploaded path, not just logs/ -- redacted-configs/ and
+          # agent-workdir/ are published by the same upload step.
+          if [ -n "${UNSLOTH_API_KEY:-}" ]; then
+            grep -rlF "$UNSLOTH_API_KEY" logs redacted-configs agent-workdir 2>/dev/null | while IFS= read -r f; do
+              sed -i "s#${UNSLOTH_API_KEY}#<REDACTED>#g" "$f" 2>/dev/null || true
+            done
+          fi
+
+      - name: Stop Studio
+        if: always()
+        run: |
+          # Guard the PID: an unset/zero UNSLOTH_SERVER_PID would make
+          # `kill 0` signal this step's whole process group and abort cleanup.
+          if [ -n "${UNSLOTH_SERVER_PID:-}" ] && [ "${UNSLOTH_SERVER_PID}" != "0" ]; then
+            kill "${UNSLOTH_SERVER_PID}" 2>/dev/null || true
+          fi
+          sleep 2
+          ss -tln 2>/dev/null | grep ":${STUDIO_PORT}" || true
+
+      - name: Upload logs
+        if: always()
+        continue-on-error: true
+        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
+        with:
+          name: prompt-cache-log
+          path: |
+            logs/
+            redacted-configs/
+          retention-days: 7
@@ -0,0 +1,79 @@
+# SPDX-License-Identifier: AGPL-3.0-only
+# Copyright 2026-present the Unsloth AI Inc. team. All rights reserved.
+#
+# Fast, focused supply-chain audit of every checked-in lockfile.
+#
+# Runs scripts/lockfile_supply_chain_audit.py on PRs that touch any
+# npm or cargo lockfile, on push to main, and on a daily schedule so
+# newly-published IOCs surface even when no PR opens.
+#
+# Default behavior is "advisory": only public indicator-of-compromise
+# strings, known-malicious pinned versions, and structurally broken
+# lockfiles fail the build. Structural anomalies (missing integrity,
+# non-default registry, etc.) are emitted as GitHub Actions warnings
+# but do not block merges. This deliberately keeps the noise floor
+# low while still failing the moment a checked-in lockfile starts
+# pointing at known-bad bytes.
+#
+# This workflow is intentionally separate from security-audit.yml:
+#   - security-audit.yml is the umbrella job (pip-audit + npm audit +
+#     cargo audit + OSV + Semgrep + secret scanning + SBOM + ...);
+#     it takes ~25 minutes and runs only when dep manifests change.
+#   - lockfile-audit.yml is a ~30 second pure-Python parse + grep on
+#     the lockfiles themselves; it runs on every PR that even nudges
+#     a lockfile so reviewers always see the audit result inline.
+
+name: Lockfile supply-chain audit
+
+on:
+  pull_request:
+    paths:
+      - 'studio/frontend/package-lock.json'
+      - 'studio/backend/core/data_recipe/oxc-validator/package-lock.json'
+      - 'studio/package-lock.json'
+      - 'studio/src-tauri/Cargo.lock'
+      - 'scripts/lockfile_supply_chain_audit.py'
+      - '.github/workflows/lockfile-audit.yml'
+  push:
+    branches: [main]
+    paths:
+      - 'studio/frontend/package-lock.json'
+      - 'studio/backend/core/data_recipe/oxc-validator/package-lock.json'
+      - 'studio/package-lock.json'
+      - 'studio/src-tauri/Cargo.lock'
+      - 'scripts/lockfile_supply_chain_audit.py'
+      - '.github/workflows/lockfile-audit.yml'
+  schedule:
+    - cron: '37 5 * * *'
+  workflow_dispatch:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+jobs:
+  audit:
+    name: lockfile supply-chain audit
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    steps:
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0  # v7.0.0
+        with:
+          persist-credentials: false
+
+      - uses: actions/setup-python@ece7cb06caefa5fff74198d8649806c4678c61a1  # v6.3.0
+        with:
+          python-version: '3.12'
+
+      - name: Verify audit script parses
+        run: python3 -c "import ast; ast.parse(open('scripts/lockfile_supply_chain_audit.py').read())"
+
+      - name: Run lockfile supply-chain audit
+        # Default mode: only known-malicious pinned versions, known IOC
+        # strings, and structurally broken lockfiles fail the build.
+        # Missing-integrity and other structural anomalies are emitted
+        # as ::warning:: annotations and do not gate merges.
+        run: python3 scripts/lockfile_supply_chain_audit.py
@@ -0,0 +1,403 @@
+# SPDX-License-Identifier: AGPL-3.0-only
+# Copyright 2026-present the Unsloth AI Inc. team. All rights reserved.
+
+# Focused PR gate for the MLX dispatch surface, running on a real
+# Apple Silicon runner.
+#
+# Runner: macos-14 (M1, 3 vCPU / 7 GB / Apple Silicon standard runner
+# -- FREE for public repositories per the GitHub Actions billing
+# reference; larger variants like macos-14-large/-xlarge are paid so
+# we deliberately avoid those).
+#
+# Why a single Mac job (no Linux+spoof leg): the dispatch tests are
+# 100% spoofed monkeypatches and run identically on any host, so the
+# Linux leg was duplicating the matrix tests already covered on Mac
+# while missing everything Apple-specific. The Mac job runs the SAME
+# spoofed matrix PLUS three things only a real Apple Silicon host
+# can prove:
+#
+#   1. unsloth._IS_MLX flips True on Darwin+arm64 with mlx genuinely
+#      installed (no spoof).
+#   2. Every PR-A MLX-only unsloth_zoo module (mlx_loader, mlx_trainer,
+#      mlx_compile, mlx_utils, mlx_cce, gated_delta_vjp) imports
+#      against the real `mlx` + `mlx-lm` + `mlx-vlm` PyPI wheels --
+#      each does `import mlx.core as mx` at module top level, so this
+#      catches a future change that breaks the real wheels without
+#      needing a Mac developer in the loop.
+#   3. The hardware-dispatch spoofs do not collide with the real
+#      environment (the test fixture installs a MetaPathFinder that
+#      blocks `import mlx.core` for "no-mlx" profiles, faithfully
+#      simulating a Mac without mlx even when mlx IS installed).
+#   4. End-to-end MLX training + inference smoke test:
+#      run_real_mlx_smoke.py trains unsloth/gemma-3-270m-it for 7
+#      deterministic LoRA steps on a single repeated text row, then
+#      verifies the trained model can complete the prompt and that
+#      losses + grad norms are finite and well-behaved. This is the
+#      only place in CI that exercises a real MLX backward pass +
+#      optimizer step + inference call.
+#
+# Three dispatch test files documented in tests/studio/README.md:
+#   - test_hardware_dispatch_matrix.py    parametrized 7-profile matrix
+#                                         + 2 dispatch-priority canaries
+#   - test_is_mlx_dispatch_gate.py        AST + runtime guard on
+#                                         unsloth._IS_MLX
+#   - test_mlx_training_worker_behaviors.py  AST contract checks on
+#                                            studio/backend/core/training/worker.py
+#
+# Surfaces a single PR check ("MLX CI on Mac M1 / dispatch").
+#
+# Security audit footprint: every package this workflow installs is
+# already covered by .github/workflows/security-audit.yml -- the deps
+# come from studio/backend/requirements/studio.txt and unsloth-zoo's
+# pyproject (resolved transitively). The git+ install of unsloth-zoo
+# is intentionally skipped by the audit (pip-audit cannot resolve a
+# git URL through PyPI metadata; the audit comment in security-audit.yml
+# documents this). No new package is introduced solely by MLX CI.
+
+name: MLX CI on Mac M1
+
+on:
+  pull_request:
+    paths:
+      - 'unsloth/__init__.py'
+      - 'unsloth/_gpu_init.py'
+      - 'studio/backend/utils/hardware/**'
+      - 'studio/backend/core/training/worker.py'
+      - 'studio/backend/core/inference/mlx_inference.py'
+      - 'tests/studio/test_hardware_dispatch_matrix.py'
+      - 'tests/studio/test_is_mlx_dispatch_gate.py'
+      - 'tests/studio/test_mlx_training_worker_behaviors.py'
+      - 'tests/studio/run_real_mlx_smoke.py'
+      - 'tests/conftest.py'
+      - '.github/workflows/mlx-ci.yml'
+  push:
+    branches: [main, pip]
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+jobs:
+  dispatch:
+    name: dispatch
+    runs-on: macos-14
+    # 25 min: dispatch + spoofed matrix + 7-step real LoRA training is
+    # under 2 min; GGUF export builds llama.cpp via cmake on Apple
+    # Silicon (~5-7 min), so we budget headroom.
+    timeout-minutes: 25
+    steps:
+      # harden-runner audit mode: macOS runners cannot use blocking mode
+      # today (eBPF egress enforcement is Linux-only), but audit mode is
+      # supported cross-platform and surfaces the egress destinations in
+      # the runner log. This produces the data needed to graduate this
+      # job to a block-mode allowlist once macOS support lands.
+      - name: Harden runner (audit)
+        uses: step-security/harden-runner@a5ad31d6a139d249332a2605b85202e8c0b78450  # v2.19.1
+        with:
+          egress-policy: audit
+
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
+
+      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
+        with:
+          python-version: '3.12'
+          cache: 'pip'
+
+      # macOS install ladder, validated locally against a Linux
+      # mac-sim venv (platform spoofed + mlx_simulation shim + real
+      # datasets/transformers/structlog).
+      #
+      # 1. studio/backend/requirements/studio.txt brings structlog,
+      #    fastapi, etc. The hardware probe imports structlog at
+      #    module top level.
+      # 2. Same pytest / numpy / httpx stack the rest of the repo CI
+      #    uses.
+      # 3. torch is explicitly installed: unsloth-zoo's pyproject
+      #    deliberately excludes torch on darwin+arm64 (mlx replaces
+      #    it for runtime use), but the dispatch tests spoof
+      #    torch.cuda / torch.xpu / torch.backends.mps via monkeypatch
+      #    and so the test process needs torch importable. We pull
+      #    from the PyTorch CPU index so Apple Silicon gets the
+      #    explicit cpu+MPS arm64 wheel rather than something the
+      #    default PyPI resolver might pick up. The CPU index hosts
+      #    macosx_*_arm64 wheels alongside the Linux x86_64 ones.
+      # 4. unsloth-zoo from git main (NOT PyPI), WITH deps. PR-A's
+      #    MLX support landed after the most recent unsloth-zoo PyPI
+      #    release; the wheel still raises NotImplementedError on
+      #    Apple Silicon when device_type.get_device_type() runs
+      #    unguarded. Studio's own install.sh overlays unsloth-zoo
+      #    from git main for the same reason. Pulling deps lets pip
+      #    resolve the platform-conditional MLX-only wheels (mlx,
+      #    mlx-lm, mlx-vlm gated on darwin+arm64 in unsloth-zoo's
+      #    pyproject) AND the shared deps (datasets, transformers,
+      #    sentencepiece, ...) that unsloth's MLX branch loads via
+      #    dataprep/raw_text.py.
+      # 5. unsloth -e . --no-deps so the editable install does not
+      #    fight the unsloth-zoo dep set.
+      #
+      # All explicit pip installs are version-pinned to a single
+      # released version (the latest as of 2026-05-07 within each
+      # project's existing constraint range). bump alongside the rest
+      # of the security audit when a new release lands.
+      - name: Install deps
+        run: |
+          python -m pip install --upgrade pip
+          pip install -r studio/backend/requirements/studio.txt
+          pip install \
+            'python-multipart==0.0.27' \
+            'aiofiles==25.1.0' \
+            'sqlalchemy==2.0.49' \
+            'cryptography==48.0.0' \
+            'pyyaml==6.0.3' \
+            'jinja2==3.1.6' \
+            'mammoth==1.12.0' \
+            'unpdf==1.0.0' \
+            'requests==2.33.1' \
+            'typer==0.25.1' \
+            'numpy==2.4.4' \
+            'pytest==9.0.3' \
+            'pytest-asyncio==1.3.0' \
+            'httpx==0.28.1'
+          pip install --index-url https://download.pytorch.org/whl/cpu --extra-index-url https://pypi.org/simple \
+            'torch==2.10.0'
+          # github.com occasionally 500s on the git fetch; retry the
+          # zoo install so a single upstream blip does not fail CI.
+          for attempt in 1 2 3; do
+            if pip install "unsloth_zoo @ git+https://github.com/unslothai/unsloth-zoo"; then
+              break
+            fi
+            if [ "$attempt" -eq 3 ]; then
+              echo "::error::pip install unsloth_zoo failed after 3 attempts"
+              exit 1
+            fi
+            delay=$((5 * attempt))
+            echo "::warning::unsloth_zoo install failed (attempt $attempt/3), retrying in ${delay}s..."
+            sleep "$delay"
+          done
+          pip install -e . --no-deps
+
+      # Real Apple Silicon sanity: confirm _IS_MLX activates on real
+      # hardware with no platform spoof.
+      - name: Verify _IS_MLX flips True on real Apple Silicon
+        run: |
+          python -c "
+          import platform
+          assert platform.system() == 'Darwin', platform.system()
+          assert platform.machine() == 'arm64', platform.machine()
+          import unsloth
+          assert unsloth._IS_MLX is True, f'expected _IS_MLX=True on real Apple Silicon, got {unsloth._IS_MLX}'
+          print('OK: _IS_MLX activated on real Apple Silicon')
+          "
+
+      # Real Apple Silicon sanity: confirm every PR-A MLX-only module
+      # loads against real mlx + mlx-lm + mlx-vlm wheels.
+      - name: Smoke-import every MLX-only unsloth_zoo module
+        run: |
+          python -c "
+          import importlib
+          for name in [
+              'unsloth_zoo.mlx_loader',
+              'unsloth_zoo.mlx_trainer',
+              'unsloth_zoo.mlx_compile',
+              'unsloth_zoo.mlx_utils',
+              'unsloth_zoo.mlx_cce',
+              'unsloth_zoo.gated_delta_vjp',
+          ]:
+              importlib.import_module(name)
+              print('OK:', name)
+          from unsloth_zoo.mlx_loader import FastMLXModel
+          from unsloth_zoo.mlx_trainer import MLXTrainer, MLXTrainingConfig
+          assert hasattr(FastMLXModel, 'from_pretrained')
+          print('OK: FastMLXModel + MLXTrainer surface present')
+          "
+
+      # Spoofed dispatch matrix. Runs on the real Mac too -- the
+      # test fixture installs a MetaPathFinder that blocks
+      # `import mlx.core` for "no-mlx" profiles, so the spoofs
+      # faithfully simulate every supported hardware combo regardless
+      # of whether mlx is installed for real.
+      - name: MLX dispatch tests (3 files, 36 tests)
+        env:
+          PYTHONPATH: ${{ github.workspace }}/studio
+          UNSLOTH_COMPILE_DISABLE: '1'
+        run: |
+          python -m pytest -v --tb=short \
+            tests/studio/test_hardware_dispatch_matrix.py \
+            tests/studio/test_is_mlx_dispatch_gate.py \
+            tests/studio/test_mlx_training_worker_behaviors.py
+
+      # Real MLX training + inference smoke test. Trains
+      # unsloth/gemma-3-270m-it for 7 deterministic LoRA steps
+      # (batch_size=2, gradient_accumulation_steps=3) on a single
+      # repeated row ("<<HELLO!!>> My name is Unsloth!"), then saves
+      # the trained model in 3 export formats. The `train` subcommand
+      # captures per-phase timing + peak GPU + peak RSS into
+      # train_metrics.json so we can detect regressions across CI runs.
+      - name: MLX export round-trip — TRAIN + SAVE 3 formats
+        env:
+          # Withheld on PR: this step runs checked-out PR code; public GGUF still downloads.
+          HF_TOKEN: ${{ github.event_name != 'pull_request' && secrets.HF_TOKEN || '' }}
+          UNSLOTH_COMPILE_DISABLE: '1'
+        run: |
+          mkdir -p mlx_workdir
+          # Authenticate llama.cpp's release-API lookup (anonymous 403s on rate-limit);
+          # read-only GITHUB_TOKEN scoped here only, never to steps that run binaries.
+          GH_TOKEN="${{ secrets.GITHUB_TOKEN }}" GITHUB_TOKEN="${{ secrets.GITHUB_TOKEN }}" \
+          python tests/studio/run_real_mlx_smoke.py train \
+            --workdir "$PWD/mlx_workdir"
+
+      # Each reload step runs in a FRESH Python process to confirm
+      # the cold-start path users would hit in production also works
+      # (not just the in-memory continuation of a still-running
+      # trainer). FastMLXModel.from_pretrained gets called from
+      # scratch; mx.random is re-seeded; per-step timing + peak
+      # memory are emitted to {format}_reload_metrics.json next to
+      # the saved dir.
+      - name: MLX export round-trip — RELOAD LoRA (fresh process)
+        env:
+          # Withheld on PR: this step runs checked-out PR code; public GGUF still downloads.
+          HF_TOKEN: ${{ github.event_name != 'pull_request' && secrets.HF_TOKEN || '' }}
+          UNSLOTH_COMPILE_DISABLE: '1'
+        run: |
+          python tests/studio/run_real_mlx_smoke.py reload \
+            --format lora \
+            --dir "$PWD/mlx_workdir/lora"
+
+      - name: MLX export round-trip — RELOAD merged_16bit (fresh process)
+        env:
+          # Withheld on PR: this step runs checked-out PR code; public GGUF still downloads.
+          HF_TOKEN: ${{ github.event_name != 'pull_request' && secrets.HF_TOKEN || '' }}
+          UNSLOTH_COMPILE_DISABLE: '1'
+        run: |
+          python tests/studio/run_real_mlx_smoke.py reload \
+            --format merged \
+            --dir "$PWD/mlx_workdir/merged_16bit"
+
+      # GGUF reload uses the llama-cli binary that save_pretrained_gguf
+      # built. If save_pretrained_gguf was skipped during train (e.g.
+      # llama.cpp's convert_hf_to_gguf asserts on the model's tokenizer
+      # vocab -- a downstream llama.cpp limitation, not an unsloth_zoo
+      # bug), this step emits a workflow warning and exits 0 so the
+      # LoRA + merged_16bit assertions remain the gating signal.
+      - name: MLX export round-trip — RELOAD GGUF via llama-cli (fresh process)
+        env:
+          # Withheld on PR: this step runs checked-out PR code; public GGUF still downloads.
+          HF_TOKEN: ${{ github.event_name != 'pull_request' && secrets.HF_TOKEN || '' }}
+        run: |
+          if python -c "import json,sys; m=json.load(open('mlx_workdir/train_metrics.json')); sys.exit(0 if m.get('gguf_supported') else 1)"; then
+            python tests/studio/run_real_mlx_smoke.py reload \
+              --format gguf \
+              --dir "$PWD/mlx_workdir/gguf"
+          else
+            REASON=$(python -c "import json; m=json.load(open('mlx_workdir/train_metrics.json')); print(m.get('gguf_skip_reason') or 'unknown')")
+            echo "::warning title=GGUF round-trip skipped::${REASON}"
+            echo "GGUF export was skipped during the train phase. Reason:"
+            echo "  ${REASON}"
+            echo "Continuing without failing the job; the LoRA + merged_16bit"
+            echo "reload assertions are still gating this PR."
+          fi
+
+      # Print all metrics JSON files so regressions are visible in the
+      # job log. always() so we get telemetry even if a reload step
+      # asserted gibberish.
+      - name: MLX export round-trip — aggregate metrics
+        if: always()
+        run: |
+          for f in mlx_workdir/train_metrics.json \
+                   mlx_workdir/lora_reload_metrics.json \
+                   mlx_workdir/merged_reload_metrics.json \
+                   mlx_workdir/gguf_reload_metrics.json; do
+            echo "=== $f ==="
+            cat "$f" 2>/dev/null || echo "(missing)"
+            echo
+          done
+
+      # Validates the macOS prebuilt path Studio's setup.sh uses (#5963): install the
+      # unslothai/llama.cpp fork's latest release, download a small public GGUF, and
+      # check llama-server /completion end to end. Split and placed last so the
+      # untrusted binary runs only in the final smoke step, after every HF_TOKEN step,
+      # leaving no token-bearing step or shared workspace for a tampered prebuilt to
+      # corrupt. GH_TOKEN: releases API; HF_TOKEN (withheld on PR): probe + GGUF fetch.
+      - name: Studio prebuilt llama.cpp install + GGUF download (Mac M1)
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          HF_TOKEN: ${{ github.event_name != 'pull_request' && secrets.HF_TOKEN || '' }}
+        run: |
+          set -euo pipefail
+          INSTALL_DIR="$HOME/.unsloth-studio-prebuilt-test/llama.cpp"
+          rm -rf "$INSTALL_DIR"
+          # Download only -- no llama-quantize / llama-server launch in this step.
+          python studio/install_llama_prebuilt.py \
+            --install-dir "$INSTALL_DIR" \
+            --published-repo unslothai/llama.cpp
+          mkdir -p /tmp/ggufs
+          bash .github/scripts/hf-download-with-retry.sh \
+            'unsloth/gemma-3-270m-it-GGUF' \
+            'gemma-3-270m-it-Q4_K_M.gguf' \
+            /tmp/ggufs
+
+      # Final step: runs the downloaded binaries with no secrets present, and clears
+      # the GitHub Actions command files so a tampered prebuilt cannot influence the job.
+      - name: Studio prebuilt llama.cpp GGUF inference smoke (Mac M1)
+        run: |
+          set -euo pipefail
+          unset GITHUB_ENV GITHUB_PATH GITHUB_OUTPUT GITHUB_STEP_SUMMARY
+          INSTALL_DIR="$HOME/.unsloth-studio-prebuilt-test/llama.cpp"
+          # Studio bundles only llama-server + llama-quantize (not llama-cli);
+          # inference goes through llama-server's HTTP /completion endpoint.
+          LLAMA_SERVER="$INSTALL_DIR/build/bin/llama-server"
+          LLAMA_QUANT="$INSTALL_DIR/build/bin/llama-quantize"
+          [ -x "$LLAMA_SERVER" ] || { echo "::error::llama-server missing at $LLAMA_SERVER"; find "$INSTALL_DIR/build" -type f | head -40; exit 1; }
+          [ -x "$LLAMA_QUANT" ]  || { echo "::error::llama-quantize missing at $LLAMA_QUANT"; exit 1; }
+          echo "llama-server : $LLAMA_SERVER"
+          echo "llama-quantize: $LLAMA_QUANT"
+          "$LLAMA_QUANT" --help >/dev/null && echo "  llama-quantize loads OK"
+
+          PORT=18080
+          echo "=== starting llama-server on 127.0.0.1:$PORT ==="
+          "$LLAMA_SERVER" \
+            -m /tmp/ggufs/gemma-3-270m-it-Q4_K_M.gguf \
+            --host 127.0.0.1 \
+            --port "$PORT" \
+            -c 256 \
+            -n 16 \
+            --no-warmup \
+            > /tmp/llama-server.log 2>&1 &
+          SERVER_PID=$!
+          trap 'kill "$SERVER_PID" 2>/dev/null || true' EXIT
+
+          # Wait for /health to come up
+          for i in $(seq 1 30); do
+            if curl -sf "http://127.0.0.1:$PORT/health" >/dev/null 2>&1; then
+              echo "  server up after ${i}s"
+              break
+            fi
+            sleep 1
+          done
+          if ! curl -sf "http://127.0.0.1:$PORT/health" >/dev/null 2>&1; then
+            echo "::error::llama-server never became healthy"
+            tail -40 /tmp/llama-server.log
+            exit 1
+          fi
+
+          PROMPT="Hello, my name is"
+          echo "=== POST /completion ==="
+          RESP=$(curl -sf -X POST "http://127.0.0.1:$PORT/completion" \
+            -H 'Content-Type: application/json' \
+            -d "{\"prompt\":\"$PROMPT\",\"n_predict\":16,\"temperature\":0,\"seed\":3407}")
+          echo "raw response (head): $(echo "$RESP" | head -c 600)"
+          CONTENT=$(echo "$RESP" | python -c "import json,sys; print(json.loads(sys.stdin.read()).get('content',''))")
+          echo "completion content: $CONTENT"
+
+          if [ -z "$CONTENT" ]; then
+            echo "::error::llama-server /completion returned empty content"
+            tail -40 /tmp/llama-server.log
+            exit 1
+          fi
+          echo "OK: Studio prebuilt llama.cpp on Mac M1 + GGUF /completion works"
@@ -0,0 +1,448 @@
+# SPDX-License-Identifier: AGPL-3.0-only
+# Copyright 2026-present the Unsloth AI Inc. team. All rights reserved.
+#
+# Cross-repo notebook validator. Lives in unslothai/unsloth (this repo)
+# and inspects every notebook in unslothai/notebooks at HEAD (or the
+# ref dispatched in via repository_dispatch).
+#
+# Catches the bug classes that landed in:
+#   - unslothai/notebooks#258  Colab torchao 0.10 vs peft 0.19 floor
+#   - unslothai/notebooks#260  DONT_UPDATE_EXCEPTIONS coverage drift
+#   - unslothai/notebooks#261  torch/torchcodec ABI; --no-deps tokenizers
+#   - unslothai/notebooks#264  --no-deps transformers + Colab tokenizers drift
+#   - unslothai/notebooks#221  git+ HEAD installs in install cells
+#   - unslothai/notebooks  commit 51b1462  template/notebook drift
+#
+# CPU-only by design. Layer 2 (api-introspect) reuses the existing
+# tests/_zoo_aggressive_cuda_spoof.py harness so `import unsloth`
+# succeeds on a GPU-less ubuntu-latest runner.
+
+name: Notebooks CI
+
+on:
+  pull_request:
+    paths:
+      - 'unsloth/**'
+      - 'scripts/notebook_validator.py'
+      - 'scripts/notebook_to_python.py'
+      - 'scripts/data/colab_pip_freeze.gpu.txt'
+      - 'scripts/data/colab_to_cpu_pin.json'
+      - 'tests/notebooks/**'
+      - 'tests/_zoo_aggressive_cuda_spoof.py'
+      - '.github/workflows/notebooks-ci.yml'
+  schedule:
+    # Daily 06:17 UTC. Catches Colab preinstall bumps (the upstream image
+    # is rebuilt roughly weekly) without us waiting on a PR. Off the
+    # :00/:30 fleet-collision spots.
+    - cron: '17 6 * * *'
+  workflow_dispatch:
+    inputs:
+      notebooks_ref:
+        description: 'unslothai/notebooks ref to lint (branch / SHA / tag)'
+        default: 'main'
+      include_smoke:
+        description: 'Also run the install-cell smoke matrix (longer)'
+        type: boolean
+        default: false
+  repository_dispatch:
+    # Fired by a tiny companion workflow on unslothai/notebooks.
+    types: [notebooks_pr_opened, notebooks_main_pushed]
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+env:
+  NOTEBOOKS_REF: >-
+    ${{ github.event.inputs.notebooks_ref ||
+        github.event.client_payload.ref ||
+        'main' }}
+
+jobs:
+  static:
+    name: static (drift + lint + exceptions)
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+    steps:
+      # Validate the dispatched ref before it reaches actions/checkout's `ref:`
+      # input. Reading via env (NOT direct ${{ ... }} interpolation in the
+      # regex test) closes the GitHub-Actions-injection class where a
+      # client_payload.ref like `main"; rm -rf / #` would be embedded into the
+      # shell command. NOTEBOOKS_REF defaults to 'main' on non-dispatch
+      # events, but only repository_dispatch can supply attacker-controlled
+      # values, so we gate this check on that event type.
+      - name: Validate client_payload.ref shape
+        if: github.event_name == 'repository_dispatch'
+        env:
+          NOTEBOOKS_REF: ${{ github.event.client_payload.ref }}
+        run: |
+          if ! printf '%s' "$NOTEBOOKS_REF" | grep -Eq '^[A-Za-z0-9._/-]+$'; then
+            echo "::error::client_payload.ref contains disallowed characters" >&2
+            exit 1
+          fi
+
+      - name: Checkout unsloth (this PR)
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          path: unsloth
+          persist-credentials: false
+
+      - name: Checkout unslothai/notebooks @ ${{ env.NOTEBOOKS_REF }}
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          repository: unslothai/notebooks
+          ref: ${{ env.NOTEBOOKS_REF }}
+          path: notebooks
+          fetch-depth: 0  # drift check needs git status / diff
+          persist-credentials: false
+
+      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
+        with:
+          python-version: '3.12'
+          cache: 'pip'
+
+      - name: Install validator deps
+        run: |
+          python -m pip install --upgrade pip
+          # nbformat + nbconvert come from the converter's requirements;
+          # spellchecker + huggingface_hub are imported at module top of
+          # update_all_notebooks.py.
+          pip install \
+            'nbformat>=5.10' 'nbconvert>=7.16' 'pyspellchecker>=0.8' \
+            'huggingface_hub>=0.34' 'tqdm>=4.66'
+
+      - name: Refresh Colab pip-freeze (best-effort; falls back to snapshot)
+        run: |
+          python unsloth/scripts/notebook_validator.py refresh-colab \
+              --out unsloth/scripts/data/colab_pip_freeze.gpu.txt \
+            || echo "::warning::refresh-colab failed; using committed snapshot"
+
+      - name: Diff Colab oracle vs committed snapshots (advisory)
+        # Pulls pip-freeze.gpu.txt + apt-list-gpu.txt + os-info-gpu.txt
+        # from googlecolab/backend-info and prints NEW / REMOVED /
+        # CHANGED entries against scripts/data/colab_*.txt. Non-blocking
+        # on PRs; the daily cron job below runs the same step with
+        # --strict so upstream rotations surface within ~24h.
+        continue-on-error: true
+        working-directory: ${{ github.workspace }}
+        run: |
+          python unsloth/scripts/notebook_validator.py colab-diff \
+              --snapshot-dir unsloth/scripts/data
+
+      - name: Drift check (re-run update_all_notebooks.py + git diff)
+        working-directory: ${{ github.workspace }}
+        # Reported as non-blocking until the upstream `unslothai/notebooks`
+        # tree is regenerated. The first run on @main surfaces ~463 files
+        # of drift (7359 / 9634 line delta), which is a real backlog the
+        # notebooks-side maintainers need to clear in their own repo --
+        # this PR's role is to surface the count, not auto-fix it.
+        continue-on-error: true
+        run: |
+          python unsloth/scripts/notebook_validator.py drift \
+              --notebooks-dir notebooks
+
+      - name: Convert sanity (every nb / kaggle / original_template -> .py)
+        # Same rationale as Drift: a handful of upstream notebooks fail
+        # the converter (custom magics, malformed JSON, etc). Surface
+        # the count without blocking; the team triages in unslothai/notebooks.
+        continue-on-error: true
+        run: |
+          python unsloth/scripts/notebook_validator.py convert \
+              --notebooks-dir notebooks \
+              --out _converted
+
+      - name: Lint (install cells + AST scan, env-scoped)
+        # Reported as non-blocking (continue-on-error: true) until the
+        # backlog of pre-existing findings on unslothai/notebooks@main is
+        # cleared. Same pattern PR #5298 used for biome:check on the
+        # frontend. As of this commit the live tree surfaces 27 errors +
+        # 6 warnings, all real (peft/torchao floor missing in 6 nb/
+        # notebooks, 14 git+ HEAD installs in hand-tuned exception
+        # notebooks, 6 torch/torchcodec ABI mismatches, 1
+        # transformers/tokenizers --no-deps drift). The count surfaces
+        # in the PR check UI. Drop continue-on-error once it hits zero.
+        continue-on-error: true
+        run: |
+          python unsloth/scripts/notebook_validator.py lint \
+              --notebooks-dir notebooks \
+              --colab-pin unsloth/scripts/data/colab_pip_freeze.gpu.txt \
+              --no-pypi
+        # --no-pypi skips R-INST-002 (transitive resolve via PyPI metadata).
+        # Layer 1 keeps PR-time wall-clock predictable; the daily cron run
+        # below drops --no-pypi and refreshes the cache.
+
+      - name: DONT_UPDATE_EXCEPTIONS coverage
+        run: |
+          python unsloth/scripts/notebook_validator.py exceptions \
+              --notebooks-dir notebooks
+
+  static-with-pypi:
+    name: static + transitive resolve (cron / dispatch only)
+    if: ${{ github.event_name == 'schedule' || github.event_name == 'workflow_dispatch' }}
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+    steps:
+      # See `static.Validate client_payload.ref shape` for rationale. This
+      # job's `if:` excludes repository_dispatch today, so the validation
+      # step is a defence-in-depth no-op until that gate ever relaxes.
+      - name: Validate client_payload.ref shape
+        if: github.event_name == 'repository_dispatch'
+        env:
+          NOTEBOOKS_REF: ${{ github.event.client_payload.ref }}
+        run: |
+          if ! printf '%s' "$NOTEBOOKS_REF" | grep -Eq '^[A-Za-z0-9._/-]+$'; then
+            echo "::error::client_payload.ref contains disallowed characters" >&2
+            exit 1
+          fi
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
+          path: unsloth
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          repository: unslothai/notebooks
+          ref: ${{ env.NOTEBOOKS_REF }}
+          path: notebooks
+          persist-credentials: false
+      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
+        with: { python-version: '3.12', cache: 'pip' }
+      - name: Install
+        run: pip install -U pip
+      - name: Refresh Colab oracle
+        run: |
+          python unsloth/scripts/notebook_validator.py refresh-colab \
+              --out unsloth/scripts/data/colab_pip_freeze.gpu.txt
+      - name: Diff Colab oracle vs committed snapshots (--strict on cron)
+        # Cron-only escalation of the advisory PR-time check. Fails if
+        # any of pip-freeze.gpu.txt / apt-list-gpu.txt / os-info-gpu.txt
+        # has drifted from scripts/data/colab_*.txt; refresh the
+        # snapshots in this repo to acknowledge.
+        run: |
+          python unsloth/scripts/notebook_validator.py colab-diff \
+              --snapshot-dir unsloth/scripts/data --strict
+      - name: Lint with live PyPI metadata
+        run: |
+          python unsloth/scripts/notebook_validator.py lint \
+              --notebooks-dir notebooks \
+              --colab-pin unsloth/scripts/data/colab_pip_freeze.gpu.txt
+
+  api-introspect:
+    name: api surface (under CUDA spoof)
+    runs-on: ubuntu-latest
+    timeout-minutes: 12
+    steps:
+      - name: Validate client_payload.ref shape
+        if: github.event_name == 'repository_dispatch'
+        env:
+          NOTEBOOKS_REF: ${{ github.event.client_payload.ref }}
+        run: |
+          if ! printf '%s' "$NOTEBOOKS_REF" | grep -Eq '^[A-Za-z0-9._/-]+$'; then
+            echo "::error::client_payload.ref contains disallowed characters" >&2
+            exit 1
+          fi
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
+          path: unsloth
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          repository: unslothai/notebooks
+          ref: ${{ env.NOTEBOOKS_REF }}
+          path: notebooks
+          persist-credentials: false
+      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
+        with: { python-version: '3.12', cache: 'pip' }
+
+      - name: Install CPU torch + pinned unsloth + trl + converter deps
+        run: |
+          python -m pip install --upgrade pip
+          # CPU torch + torchvision. torchvision is required because
+          # unsloth_zoo.vision_utils imports PIL at module top, and the
+          # easiest way to get a torch-compatible PIL on a CPU runner is
+          # to let torchvision pull the right Pillow version.
+          pip install --index-url https://download.pytorch.org/whl/cpu --extra-index-url https://pypi.org/simple \
+                      'torch>=2.8,<2.11' 'torchvision<0.26'
+          # Pin to the same versions update_all_notebooks.py installs in
+          # generated notebooks. Keep these in lockstep with PIN_TRL /
+          # PIN_TRANSFORMERS in unslothai/notebooks/update_all_notebooks.py.
+          # `triton` is added because unsloth/_gpu_init.py:232 does an
+          # unconditional `import triton`; the PyPI wheel installs cleanly
+          # on Linux x86_64 even without CUDA (same rationale as
+          # consolidated-tests-ci.yml line 192-205).
+          # Pillow is listed explicitly as a defensive belt-and-braces
+          # next to torchvision (vision_utils crashes ModuleNotFoundError
+          # if torchvision skipped its Pillow dep for any reason).
+          pip install 'transformers>=4.56,<5.6' 'trl>=0.22,<0.26' 'accelerate>=1.0' \
+                      'datasets>=3.4,<5' 'peft>=0.15,<0.20' \
+                      'bitsandbytes>=0.43' 'sentencepiece' 'protobuf' triton \
+                      Pillow safetensors tqdm packaging psutil
+          # Converter deps (nbformat for notebook_to_python.py).
+          pip install 'nbformat>=5.10' 'nbconvert>=7.16'
+          # Install unsloth from the LOCAL checkout (the PR head), not PyPI.
+          # The PR-time CI must validate the code in this PR; PyPI unsloth
+          # may lag the in-repo CPU-torch fallback in unsloth/kernels/utils.py
+          # (lines 162-170) that handles missing torch._C._cuda_getCurrentRawStream.
+          # unsloth_zoo from git main mirrors every other CI (Core / MLX /
+          # install.sh) so PR-time validation sees the same zoo HEAD.
+          for attempt in 1 2 3; do
+            if pip install --no-deps "unsloth_zoo @ git+https://github.com/unslothai/unsloth-zoo"; then
+              break
+            fi
+            [ "$attempt" -eq 3 ] && { echo "::error::unsloth_zoo install failed after 3 attempts"; exit 1; }
+            sleep $((5 * attempt))
+          done
+          pip install --no-deps -e ./unsloth
+
+      - name: Convert notebooks for AST scan
+        # Same upstream-conversion-error tolerance as the static job.
+        continue-on-error: true
+        run: |
+          python unsloth/scripts/notebook_validator.py convert \
+              --notebooks-dir notebooks --out _converted
+
+      - name: Dump unsloth + trl API surface (under CUDA spoof)
+        run: |
+          PYTHONPATH=unsloth/tests python -u - <<'PY'
+          import sys, json, inspect
+          import _zoo_aggressive_cuda_spoof as _spoof
+          _spoof.apply()
+          import unsloth
+          import trl
+          surface = {}
+          for cls_name in ("FastLanguageModel", "FastVisionModel", "FastModel"):
+              cls = getattr(unsloth, cls_name, None)
+              if cls is None:
+                  continue
+              surface[cls_name] = sorted(n for n in dir(cls) if not n.startswith("_"))
+          surface["SFTConfig_kwargs"] = sorted(inspect.signature(trl.SFTConfig.__init__).parameters)
+          json.dump(surface, open("_api_surface.json", "w"), indent=2)
+          print("dumped surface for:", list(surface))
+          PY
+
+      - name: Run API rule against converted notebooks
+        run: |
+          python unsloth/scripts/notebook_validator.py api \
+              --converted-dir _converted \
+              --surface _api_surface.json
+
+  smoke-install:
+    name: smoke install (Colab-shaped venv, opt-in)
+    if: ${{ github.event.inputs.include_smoke == 'true' || github.event_name == 'schedule' }}
+    runs-on: ubuntu-latest
+    timeout-minutes: 25
+    strategy:
+      fail-fast: false
+      matrix:
+        # One representative notebook per installation_*_content template.
+        # Add rows when a new install template lands in update_all_notebooks.py.
+        notebook:
+          - 'nb/Llama3.1_(8B)-Alpaca.ipynb'           # installation_content
+          - 'nb/Gemma3_(4B)-Vision.ipynb'             # installation_content + vision
+          - 'nb/Llama3.1_(8B)-GRPO.ipynb'             # installation_extra_grpo_content
+          - 'nb/gpt-oss-(20B)-Fine-tuning.ipynb'      # installation_gpt_oss_content
+          - 'nb/Qwen3_5_(4B)_Vision.ipynb'            # installation_qwen3_5_content
+          - 'nb/Nemotron-3-Nano-30B-A3B_A100.ipynb'   # installation_nemotron_nano_content
+          - 'nb/Whisper.ipynb'                         # installation_whisper_content
+          - 'nb/Synthetic_Data_Hackathon.ipynb'        # installation_synthetic_data_content
+    steps:
+      - name: Validate client_payload.ref shape
+        if: github.event_name == 'repository_dispatch'
+        env:
+          NOTEBOOKS_REF: ${{ github.event.client_payload.ref }}
+        run: |
+          if ! printf '%s' "$NOTEBOOKS_REF" | grep -Eq '^[A-Za-z0-9._/-]+$'; then
+            echo "::error::client_payload.ref contains disallowed characters" >&2
+            exit 1
+          fi
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
+          path: unsloth
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          repository: unslothai/notebooks
+          ref: ${{ env.NOTEBOOKS_REF }}
+          path: notebooks
+          persist-credentials: false
+      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
+        with: { python-version: '3.12' }
+
+      - name: Seed Colab-shaped venv from pip-freeze (CPU-mapped)
+        run: |
+          # Strip cu128 local versions, route torch/torchvision to the CPU
+          # wheel index, drop CUDA-specific deps the runner can't use.
+          python -u - <<'PY' > /tmp/seed_pins.txt
+          import json, re
+          mapping = json.load(open("unsloth/scripts/data/colab_to_cpu_pin.json"))
+          rewrite = mapping["rewrite"]
+          skip = set(mapping["skip"])
+          spoof = set(mapping["module_spoof"])
+          out = []
+          for line in open("unsloth/scripts/data/colab_pip_freeze.gpu.txt"):
+              line = line.strip()
+              if not line or line.startswith("#"):
+                  continue
+              m = re.match(r"^([A-Za-z0-9._-]+)\s*==\s*(.+)$", line)
+              if not m:
+                  continue
+              name, ver = m.group(1).lower(), m.group(2)
+              if name in skip:
+                  continue
+              if name in spoof:
+                  continue
+              if name in rewrite:
+                  ver = re.sub(r"[+\-].+$", "", ver)
+                  out.append(f"{name}=={ver}")
+              else:
+                  ver = re.sub(r"[+\-].+$", "", ver)
+                  out.append(f"{name}=={ver}")
+          print("\n".join(out))
+          PY
+          head -5 /tmp/seed_pins.txt
+          wc -l /tmp/seed_pins.txt
+
+      - name: Install Colab-shaped venv
+        run: |
+          python -m pip install --upgrade pip
+          # Best-effort: any single line that fails to resolve on CPU is
+          # tolerated; the smoke contract is "the install cell + the unsloth
+          # import works", not "the entire Colab venv reproduces."
+          while IFS= read -r spec; do
+            pip install "$spec" --index-url https://download.pytorch.org/whl/cpu \
+              --extra-index-url https://pypi.org/simple || \
+              echo "::warning::pin failed: $spec"
+          done < /tmp/seed_pins.txt
+
+      - name: Run install cell
+        run: |
+          python unsloth/scripts/notebook_validator.py convert \
+              --notebooks-dir notebooks --out _converted
+          # Take the converted .py and run the install cell only.
+          BASE="$(basename '${{ matrix.notebook }}' .ipynb | tr -d '()' | tr -c '[:alnum:]_' _)"
+          PY="_converted/${BASE}.py"
+          [ -f "$PY" ] || { echo "::error::$PY not found"; ls _converted | head; exit 1; }
+          # Truncate at the first `from unsloth import` so we run install +
+          # core imports only.
+          awk '/^from unsloth import/ { print "import sys; sys.exit(0)"; exit } { print }' "$PY" > _smoke.py
+          PYTHONPATH=unsloth/tests python -u - <<'PY'
+          import _zoo_aggressive_cuda_spoof as _s; _s.apply()
+          # Stub torchcodec for cells that import it — no CPU wheel exists.
+          import sys, types
+          if "torchcodec" not in sys.modules:
+              sys.modules["torchcodec"] = types.ModuleType("torchcodec")
+          exec(open("_smoke.py").read(), {"__name__": "__main__"})
+          PY
+
+      - name: Verify imports under spoof
+        run: |
+          PYTHONPATH=unsloth/tests python -u - <<'PY'
+          import sys, types
+          if "torchcodec" not in sys.modules:
+              sys.modules["torchcodec"] = types.ModuleType("torchcodec")
+          import _zoo_aggressive_cuda_spoof as _s; _s.apply()
+          import unsloth, peft, torch, torchao, transformers, tokenizers
+          print("OK: imports pass under CUDA spoof")
+          PY
@@ -0,0 +1,78 @@
+# This workflow uses actions that are not certified by GitHub. They are provided
+# by a third-party and are governed by separate terms of service, privacy
+# policy, and support documentation.
+
+name: Scorecard supply-chain security
+on:
+  # For Branch-Protection check. Only the default branch is supported. See
+  # https://github.com/ossf/scorecard/blob/main/docs/checks.md#branch-protection
+  branch_protection_rule:
+  # To guarantee Maintained check is occasionally updated. See
+  # https://github.com/ossf/scorecard/blob/main/docs/checks.md#maintained
+  schedule:
+    - cron: '21 20 * * 0'
+  push:
+    branches: [ "main" ]
+
+# Declare default permissions as read only.
+permissions: read-all
+
+jobs:
+  analysis:
+    name: Scorecard analysis
+    runs-on: ubuntu-latest
+    # `publish_results: true` only works when run from the default branch. conditional can be removed if disabled.
+    if: github.event.repository.default_branch == github.ref_name || github.event_name == 'pull_request'
+    permissions:
+      # Needed to upload the results to code-scanning dashboard.
+      security-events: write
+      # Needed to publish results and get a badge (see publish_results below).
+      id-token: write
+      # Uncomment the permissions below if installing in a private repository.
+      # contents: read
+      # actions: read
+
+    steps:
+      - name: "Checkout code"
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+        with:
+          persist-credentials: false
+
+      - name: "Run analysis"
+        uses: ossf/scorecard-action@f49aabe0b5af0936a0987cfb85d86b75731b0186 # v2.4.1
+        with:
+          results_file: results.sarif
+          results_format: sarif
+          # (Optional) "write" PAT token. Uncomment the `repo_token` line below if:
+          # - you want to enable the Branch-Protection check on a *public* repository, or
+          # - you are installing Scorecard on a *private* repository
+          # To create the PAT, follow the steps in https://github.com/ossf/scorecard-action?tab=readme-ov-file#authentication-with-fine-grained-pat-optional.
+          # repo_token: ${{ secrets.SCORECARD_TOKEN }}
+
+          # Public repositories:
+          #   - Publish results to OpenSSF REST API for easy access by consumers
+          #   - Allows the repository to include the Scorecard badge.
+          #   - See https://github.com/ossf/scorecard-action#publishing-results.
+          # For private repositories:
+          #   - `publish_results` will always be set to `false`, regardless
+          #     of the value entered here.
+          publish_results: true
+
+          # (Optional) Uncomment file_mode if you have a .gitattributes with files marked export-ignore
+          # file_mode: git
+
+      # Upload the results as artifacts (optional). Commenting out will disable uploads of run results in SARIF
+      # format to the repository Actions tab.
+      - name: "Upload artifact"
+        uses: actions/upload-artifact@4cec3d8aa04e39d1a68397de0c4cd6fb9dce8ec1 # v4.6.1
+        with:
+          name: SARIF file
+          path: results.sarif
+          retention-days: 5
+
+      # Upload the results to GitHub's code scanning dashboard (optional).
+      # Commenting out will disable upload of results to your repo's Code Scanning dashboard
+      - name: "Upload to code-scanning"
+        uses: github/codeql-action/upload-sarif@v3
+        with:
+          sarif_file: results.sarif
@@ -0,0 +1,995 @@
+name: Release Desktop App
+
+on:
+  workflow_dispatch:
+    inputs:
+      studio_version:
+        description: 'Studio version tag to release (for example, v0.1.39-beta)'
+        type: string
+        required: true
+      pypi_version:
+        description: 'Exact PyPI unsloth version just published/stamped (for example, 2026.5.3); leave blank to use MIN_DESKTOP_BACKEND_VERSION'
+        type: string
+        required: false
+      draft:
+        description: 'Create as draft release; draft runs do not advance desktop-latest updater channel'
+        type: boolean
+        default: true
+
+permissions:
+  contents: read
+
+concurrency:
+  group: release-desktop-${{ github.repository }}
+  cancel-in-progress: false
+
+jobs:
+  prepare-version:
+    name: Prepare release versions
+    runs-on: ubuntu-latest
+    outputs:
+      studio_version: ${{ steps.prepare.outputs.studio_version }}
+      app_version: ${{ steps.prepare.outputs.app_version }}
+      desktop_release_tag: ${{ steps.prepare.outputs.desktop_release_tag }}
+      prerelease: ${{ steps.prepare.outputs.prerelease }}
+      pypi_version: ${{ steps.prepare.outputs.pypi_version }}
+
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd
+        with:
+          persist-credentials: false
+
+      - name: Validate release versions
+        id: prepare
+        shell: bash
+        env:
+          INPUT_STUDIO_VERSION: ${{ inputs.studio_version }}
+          INPUT_PYPI_VERSION: ${{ inputs.pypi_version }}
+        run: |
+          python3 <<'PY'
+          import os
+          import pathlib
+          import re
+          import sys
+
+          studio_version = os.environ['INPUT_STUDIO_VERSION'].strip()
+          if not studio_version:
+              sys.exit('studio_version is required, for example v0.1.39-beta')
+          if re.fullmatch(r'v?20\d{2}\.\d+\.\d+(?:[-+][0-9A-Za-z.-]+)?', studio_version):
+              sys.exit(f'studio_version must be a Studio SemVer tag, not a date-style backend version: {studio_version}')
+
+          semver_tag = re.compile(
+              r'^v(0|[1-9]\d*)\.(0|[1-9]\d*)\.(0|[1-9]\d*)'
+              r'(?:-[0-9A-Za-z.][0-9A-Za-z.-]*)?$'
+          )
+          if not semver_tag.fullmatch(studio_version):
+              sys.exit(f'studio_version must be a SemVer tag with leading v, for example v0.1.39-beta: {studio_version}')
+
+          app_version = studio_version.removeprefix('v')
+          desktop_release_tag = f'desktop-v{app_version}'
+          prerelease = 'true' if '-' in app_version.split('+', 1)[0] else 'false'
+
+          def parse_backend_version(version):
+              match = re.fullmatch(
+                  r'(0|[1-9]\d*)\.(0|[1-9]\d*)\.(0|[1-9]\d*)'
+                  r'(?:([a-zA-Z]|\.dev|dev|\.rc|rc|\.post|post)(\d*))?'
+                  r'(?:[-+]([0-9A-Za-z-]+(?:\.[0-9A-Za-z-]+)*))?',
+                  version,
+              )
+              if not match:
+                  return None
+              major, minor, patch, suffix_name, suffix_number, suffix_text = match.groups()
+              if suffix_name:
+                  normalized = suffix_name.lower().lstrip('.')
+                  order = {'dev': 0, 'a': 1, 'b': 2, 'rc': 3, 'post': 5}.get(normalized)
+                  if order is None:
+                      return None
+                  number = int(suffix_number or '0')
+              elif suffix_text:
+                  order = 3 if version[version.find(suffix_text) - 1] == '-' else 4
+                  number = 0
+              else:
+                  order = 4
+                  number = 0
+              return (int(major), int(minor), int(patch), order, number)
+
+          preflight = pathlib.Path('studio/src-tauri/src/preflight/version.rs').read_text()
+          match = re.search(r'MIN_DESKTOP_BACKEND_VERSION:\s*&str\s*=\s*"([^"]+)"', preflight)
+          if not match:
+              sys.exit('Could not read MIN_DESKTOP_BACKEND_VERSION')
+          min_backend_version = match.group(1)
+
+          input_pypi_version = os.environ.get('INPUT_PYPI_VERSION', '').strip()
+          parsed_min_backend = parse_backend_version(min_backend_version)
+          if parsed_min_backend is None:
+              sys.exit(f'MIN_DESKTOP_BACKEND_VERSION is not a supported backend package version: {min_backend_version}')
+
+          pypi_version = input_pypi_version or min_backend_version
+          parsed_pypi = parse_backend_version(pypi_version)
+          if parsed_pypi is None:
+              sys.exit(f'pypi_version is not a supported backend package version: {pypi_version}')
+          if parsed_pypi < parsed_min_backend:
+              sys.exit(
+                  f'pypi_version {pypi_version} is lower than desktop minimum '
+                  f'MIN_DESKTOP_BACKEND_VERSION {min_backend_version}'
+              )
+
+          if input_pypi_version:
+              print(
+                  'Using exact PyPI unsloth version from pypi_version input: '
+                  f'{pypi_version} (desktop minimum: {min_backend_version})'
+              )
+          else:
+              print(
+                  'Using exact PyPI unsloth version from MIN_DESKTOP_BACKEND_VERSION: '
+                  f'{pypi_version}'
+              )
+
+          with open(os.environ['GITHUB_OUTPUT'], 'a', encoding='utf-8') as output:
+              print(f'studio_version={studio_version}', file=output)
+              print(f'app_version={app_version}', file=output)
+              print(f'desktop_release_tag={desktop_release_tag}', file=output)
+              print(f'prerelease={prerelease}', file=output)
+              print(f'pypi_version={pypi_version}', file=output)
+          PY
+
+      - name: Verify PyPI package and Studio stamp
+        shell: bash
+        env:
+          STUDIO_VERSION: ${{ steps.prepare.outputs.studio_version }}
+          PYPI_VERSION: ${{ steps.prepare.outputs.pypi_version }}
+        run: |
+          set -euo pipefail
+          python3 <<'PY'
+          import json
+          import os
+          import pathlib
+          import sys
+          import time
+          import urllib.error
+          import urllib.request
+
+          pypi_version = os.environ['PYPI_VERSION']
+          dist_dir = pathlib.Path(os.environ['RUNNER_TEMP'], 'pypi-unsloth-dist')
+          dist_dir.mkdir(parents=True, exist_ok=True)
+          metadata_url = f'https://pypi.org/pypi/unsloth/{pypi_version}/json'
+
+          last_error = None
+          for attempt in range(1, 6):
+              try:
+                  with urllib.request.urlopen(metadata_url, timeout=30) as response:
+                      metadata = json.load(response)
+                  break
+              except Exception as exc:
+                  last_error = exc
+                  if attempt < 5:
+                      time.sleep(10 * attempt)
+          else:
+              sys.exit(f'Publish unsloth=={pypi_version} to PyPI before the desktop release ({last_error})')
+
+          files = metadata.get('urls') or []
+          if not files:
+              sys.exit(f'PyPI returned no distribution files for unsloth=={pypi_version}')
+
+          for file_info in files:
+              filename = file_info.get('filename')
+              url = file_info.get('url')
+              if not filename or '/' in filename or not url:
+                  sys.exit(f'Unexpected PyPI file entry for unsloth=={pypi_version}: {file_info!r}')
+              target = dist_dir / filename
+              for attempt in range(1, 4):
+                  try:
+                      with urllib.request.urlopen(url, timeout=60) as response:
+                          target.write_bytes(response.read())
+                      break
+                  except Exception as exc:
+                      last_error = exc
+                      if attempt < 3:
+                          time.sleep(5 * attempt)
+              else:
+                  sys.exit(f'Could not download {filename} from PyPI ({last_error})')
+          PY
+
+          if [ -f scripts/stamp_studio_release.py ]; then
+            mapfile -t dists < <(find "$RUNNER_TEMP/pypi-unsloth-dist" -type f \( -name '*.whl' -o -name '*.tar.gz' \) | sort)
+            if [ "${#dists[@]}" -eq 0 ]; then
+              echo "No PyPI wheel/sdist artifacts downloaded for unsloth==$PYPI_VERSION" >&2
+              exit 1
+            fi
+            python3 scripts/stamp_studio_release.py --verify-dist "$RUNNER_TEMP/pypi-unsloth-dist" --expected "$STUDIO_VERSION"
+          else
+            echo "scripts/stamp_studio_release.py not found; release-desktop requires #5308 to verify the PyPI Studio stamp." >&2
+            exit 1
+          fi
+
+      - name: Guard public updater channel version
+        if: ${{ !inputs.draft }}
+        shell: bash
+        env:
+          GH_REPO: ${{ github.repository }}
+          GH_TOKEN: ${{ github.token }}
+          APP_VERSION: ${{ steps.prepare.outputs.app_version }}
+        run: |
+          set -euo pipefail
+          mkdir -p "$RUNNER_TEMP/desktop-current"
+          if ! gh release download desktop-latest --pattern latest.json --dir "$RUNNER_TEMP/desktop-current" --clobber 2>/dev/null; then
+            echo "No existing desktop-latest latest.json found; allowing first channel publish."
+            exit 0
+          fi
+          python3 <<'PY'
+          import json
+          import os
+          import pathlib
+          import re
+          import sys
+
+          def parse(value: str):
+              value = value.removeprefix('v')
+              match = re.fullmatch(
+                  r'(0|[1-9]\d*)\.(0|[1-9]\d*)\.(0|[1-9]\d*)'
+                  r'(?:-([0-9A-Za-z-]+(?:\.[0-9A-Za-z-]+)*))?'
+                  r'(?:\+[0-9A-Za-z-]+(?:\.[0-9A-Za-z-]+)*)?',
+                  value,
+              )
+              if not match:
+                  sys.exit(f'desktop-latest latest.json has invalid version: {value}')
+              major, minor, patch, prerelease = match.groups()
+              return (int(major), int(minor), int(patch), prerelease)
+
+          def numeric_tail(identifier: str) -> tuple[str, int] | None:
+              match = re.fullmatch(r'([A-Za-z-]+)(\d+)', identifier)
+              if not match:
+                  return None
+              return (match.group(1).lower(), int(match.group(2)))
+
+          def compare_identifier(left: str, right: str) -> int:
+              left_num = left.isdigit()
+              right_num = right.isdigit()
+              if left_num and right_num:
+                  return (int(left) > int(right)) - (int(left) < int(right))
+              if left_num:
+                  return -1
+              if right_num:
+                  return 1
+
+              left_tail = numeric_tail(left)
+              right_tail = numeric_tail(right)
+              if left_tail and right_tail and left_tail[0] == right_tail[0]:
+                  return (left_tail[1] > right_tail[1]) - (left_tail[1] < right_tail[1])
+
+              return (left > right) - (left < right)
+
+          def compare_prerelease(left: str | None, right: str | None) -> int:
+              if left == right:
+                  return 0
+              if left is None:
+                  return 1
+              if right is None:
+                  return -1
+              left_parts = left.split('.')
+              right_parts = right.split('.')
+              for left_part, right_part in zip(left_parts, right_parts):
+                  order = compare_identifier(left_part, right_part)
+                  if order:
+                      return order
+              return (len(left_parts) > len(right_parts)) - (len(left_parts) < len(right_parts))
+
+          def compare(left: str, right: str) -> int:
+              left_major, left_minor, left_patch, left_pre = parse(left)
+              right_major, right_minor, right_patch, right_pre = parse(right)
+              left_core = (left_major, left_minor, left_patch)
+              right_core = (right_major, right_minor, right_patch)
+              if left_core != right_core:
+                  return (left_core > right_core) - (left_core < right_core)
+              return compare_prerelease(left_pre, right_pre)
+
+          current_path = pathlib.Path(os.environ['RUNNER_TEMP'], 'desktop-current', 'latest.json')
+          current = json.loads(current_path.read_text()).get('version')
+          next_version = os.environ['APP_VERSION']
+          if not isinstance(current, str):
+              sys.exit('desktop-latest latest.json has missing version')
+          if compare(next_version, current) < 0:
+              sys.exit(
+                  f'Refusing to publish {next_version}; desktop-latest currently points at newer version {current}.'
+              )
+          PY
+
+  build:
+    # TODO: split into a "build (no secrets)" + "publish (secrets)" job pair
+    # with actions/upload-artifact handoff so the matrix build cannot
+    # publish a Release on its own. The current matrix runs across
+    # Linux/macOS/Windows in a single job, so the split needs artefact
+    # collection across the OS matrix and is out of scope for this
+    # hardening pass.
+    permissions:
+      contents: write  # tauri-apps/tauri-action creates / uploads a GitHub Release
+    strategy:
+      fail-fast: false
+      max-parallel: 1
+      matrix:
+        include:
+          - platform: macos-latest
+            args: '--target aarch64-apple-darwin'
+            label: macOS (Apple Silicon)
+          # - platform: macos-latest
+          #   args: '--target x86_64-apple-darwin'
+          #   label: macOS (Intel)
+          - platform: ubuntu-22.04
+            args: ''
+            label: Linux (x64)
+          - platform: windows-latest
+            args: ''
+            label: Windows (x64)
+
+    name: Build ${{ matrix.label }}
+    needs: prepare-version
+    runs-on: ${{ matrix.platform }}
+
+    env:
+      FORCE_JAVASCRIPT_ACTIONS_TO_NODE24: true
+      APP_VERSION: ${{ needs.prepare-version.outputs.app_version }}
+      STUDIO_VERSION: ${{ needs.prepare-version.outputs.studio_version }}
+      DESKTOP_RELEASE_TAG: ${{ needs.prepare-version.outputs.desktop_release_tag }}
+      DESKTOP_PRERELEASE: ${{ needs.prepare-version.outputs.prerelease }}
+
+    steps:
+      # harden-runner in audit mode: surfaces every egress destination in
+      # the runner log so the allowlist for a future `egress-policy: block`
+      # promotion can be derived from observed traffic. Audit mode is
+      # cross-platform (Linux / macOS / Windows runners); blocking mode is
+      # currently Linux-only, so we deliberately stay in audit until the
+      # macOS + Windows codesign paths have been observed.
+      - name: Harden runner (audit)
+        uses: step-security/harden-runner@a5ad31d6a139d249332a2605b85202e8c0b78450  # v2.19.1
+        with:
+          egress-policy: audit
+
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd
+        with:
+          persist-credentials: false
+
+      # ── Linux dependencies ──
+      - name: Install Linux dependencies
+        if: matrix.platform == 'ubuntu-22.04'
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y libwebkit2gtk-4.1-dev libappindicator3-dev librsvg2-dev libxdo-dev libssl-dev patchelf
+
+      # ── Node.js ──
+      - name: Setup Node.js
+        uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e
+        with:
+          node-version: 24
+
+      - name: Install pinned Tauri CLI
+        # Lifecycle scripts (esbuild native-binary postinstall, etc.) are
+        # required for `vite build`. The pre-install lockfile structural
+        # audit (lockfile_supply_chain_audit.py) is the practical defence
+        # against the npm postinstall-dropper class -- it fires BEFORE any
+        # tarball runs, on the injection pattern itself rather than an
+        # advisory-DB lookup.
+        run: npm install --save-dev --prefix studio @tauri-apps/cli@2.10.1 --no-fund --no-audit
+
+      - name: Verify pinned Tauri CLI
+        shell: bash
+        run: |
+          out="$(npx --prefix studio tauri --version)"
+          echo "$out"
+          if [ "$out" != "tauri-cli 2.10.1" ]; then
+            echo "Expected tauri-cli 2.10.1, got $out" >&2
+            exit 1
+          fi
+
+      - name: Verify desktop updater and Linux package config
+        shell: bash
+        run: |
+          node <<'JS'
+          const { readFileSync } = require('node:fs');
+
+          const expected = 'https://github.com/unslothai/unsloth/releases/download/desktop-latest/latest.json';
+          const config = JSON.parse(readFileSync('studio/src-tauri/tauri.conf.json', 'utf8'));
+          const endpoints = config.plugins?.updater?.endpoints;
+          if (!Array.isArray(endpoints) || endpoints.length !== 1) {
+            throw new Error('Expected exactly one desktop updater endpoint');
+          }
+          if (endpoints[0] !== expected) {
+            throw new Error('Desktop updater endpoint must be ' + expected + ', got ' + endpoints[0]);
+          }
+          if (endpoints.some((endpoint) => endpoint.includes('/releases/latest/'))) {
+            throw new Error('Desktop updater endpoint must not use repo-wide /releases/latest/');
+          }
+
+          const targets = config.bundle?.targets;
+          if (Array.isArray(targets) && targets.some((target) => String(target).toLowerCase() === 'rpm')) {
+            throw new Error('Desktop release must not target RPM packages');
+          }
+          if (config.bundle?.linux?.rpm) {
+            throw new Error('bundle.linux.rpm must not be configured');
+          }
+          if (config.bundle?.linux?.appimage?.bundleMediaFramework !== false) {
+            throw new Error('Linux AppImage bundleMediaFramework must stay false');
+          }
+
+          const workflow = readFileSync('.github/workflows/release-desktop.yml', 'utf8');
+          const lines = workflow.split(/\r?\n/);
+          const linuxInstallLines = lines.filter((line) => line.includes('sudo apt-get install'));
+          const ayatanaPackage = ['libayatana', 'appindicator3-dev'].join('-');
+          if (linuxInstallLines.some((line) => line.includes(ayatanaPackage))) {
+            throw new Error('Desktop Linux release must not install the Ayatana appindicator dev package');
+          }
+          if (!linuxInstallLines.some((line) => line.includes('libappindicator3-dev'))) {
+            throw new Error('Desktop Linux release must install libappindicator3-dev');
+          }
+          const linuxdeployLines = lines.filter((line) => line.includes('github.com/linuxdeploy/linuxdeploy/releases/download'));
+          if (!linuxdeployLines.some((line) => line.includes('1-alpha-20250213-2/linuxdeploy-x86_64.AppImage'))) {
+            throw new Error('Desktop Linux release must pin linuxdeploy 1-alpha-20250213-2');
+          }
+          // A pinned version/path is reproducibility, not integrity: the asset
+          // can be replaced after upload. Require the immutable SHA-256 digest
+          // to be pinned AND verified before chmod +x. Scope every check to the
+          // real "Pin linuxdeploy for AppImage" step so this guard cannot
+          // satisfy itself; a file-wide scan would match the guard's own code.
+          const expectedLinuxdeployDigest = '4648f278ab3ef31f819e67c30d50f462640e5365a77637d7e6f2ad9fd0b4522a';
+          const isComment = (line) => {
+            const trimmed = line.trim();
+            return trimmed.startsWith('#') || trimmed.startsWith('//');
+          };
+          const stepStart = lines.findIndex((line) => /^\s*- name: Pin linuxdeploy for AppImage\s*$/.test(line));
+          if (stepStart === -1) {
+            throw new Error('Desktop Linux release must keep the "Pin linuxdeploy for AppImage" step');
+          }
+          const stepIndent = lines[stepStart].search(/\S/);
+          let stepEnd = lines.length;
+          for (let i = stepStart + 1; i < lines.length; i += 1) {
+            const line = lines[i];
+            if (line.trim() === '') continue;
+            const indent = line.search(/\S/);
+            // The next sibling step ('- ...') at the same indent, or any dedent
+            // below the step, ends this step's block.
+            if (indent < stepIndent || (indent === stepIndent && /^\s*-\s/.test(line))) {
+              stepEnd = i;
+              break;
+            }
+          }
+          const stepLines = lines.slice(stepStart, stepEnd);
+          const digestEnvRe = /^\s*LINUXDEPLOY_SHA256:\s*["']([0-9a-f]{64})["']\s*$/;
+          const digestEnvLine = stepLines.find((line) => digestEnvRe.test(line));
+          if (!digestEnvLine || digestEnvLine.match(digestEnvRe)[1] !== expectedLinuxdeployDigest) {
+            throw new Error('Desktop Linux release must pin the linuxdeploy SHA-256 digest in the LINUXDEPLOY_SHA256 env');
+          }
+          const sha256Idx = stepLines.findIndex((line) => !isComment(line) && line.includes('sha256sum -c'));
+          if (sha256Idx === -1) {
+            throw new Error('Desktop Linux release must verify the linuxdeploy digest with sha256sum -c before use');
+          }
+          const chmodIdx = stepLines.findIndex((line) => !isComment(line) && /chmod\s+\+x/.test(line));
+          if (chmodIdx !== -1 && sha256Idx > chmodIdx) {
+            throw new Error('Desktop Linux release must verify the linuxdeploy digest before chmod +x');
+          }
+          const releaseBodies = [];
+          for (let i = 0; i < lines.length; i += 1) {
+            const match = lines[i].match(/^(\s*)releaseBody:\s*\|\s*$/);
+            if (!match) continue;
+            const baseIndent = match[1].length;
+            const bodyLines = [];
+            i += 1;
+            for (; i < lines.length; i += 1) {
+              const line = lines[i];
+              if (line.trim() === '') {
+                bodyLines.push('');
+                continue;
+              }
+              const indent = line.match(/^\s*/)[0].length;
+              if (indent <= baseIndent) {
+                i -= 1;
+                break;
+              }
+              bodyLines.push(line.slice(baseIndent + 2));
+            }
+            releaseBodies.push(bodyLines.join('\n'));
+          }
+          if (releaseBodies.length === 0) {
+            throw new Error('Expected at least one desktop release body');
+          }
+          for (const body of releaseBodies) {
+            if (/\brpm\b|\.rpm/i.test(body)) {
+              throw new Error('Desktop release body must not advertise RPM packages');
+            }
+            if (/AppImage.*universal|universal.*AppImage/i.test(body)) {
+              throw new Error('Desktop release body must not advertise AppImage as universal');
+            }
+            if (!/AppImage.*experimental/i.test(body)) {
+              throw new Error('Desktop release body must mark AppImage as experimental');
+            }
+          }
+          JS
+
+      - name: Install frontend dependencies
+        working-directory: studio/frontend
+        # Lifecycle scripts (esbuild native-binary postinstall, etc.) are
+        # required for `vite build`. The pre-install lockfile structural
+        # audit (lockfile_supply_chain_audit.py) is the practical defence
+        # against the npm postinstall-dropper class -- it fires BEFORE any
+        # tarball runs, on the injection pattern itself rather than an
+        # advisory-DB lookup.
+        run: npm install --no-fund --no-audit
+
+      # ── Rust ──
+      - name: Install Rust stable
+        uses: dtolnay/rust-toolchain@29eef336d9b2848a0b548edc03f92a220660cdb8  # stable @ 2026-03-27
+        with:
+          targets: ${{ matrix.platform == 'macos-latest' && 'aarch64-apple-darwin,x86_64-apple-darwin' || '' }}
+
+      - name: Patch desktop app version
+        shell: bash
+        working-directory: studio/src-tauri
+        run: |
+          set -euo pipefail
+          if command -v python3 >/dev/null 2>&1; then
+            PYTHON=python3
+          else
+            PYTHON=python
+          fi
+          "$PYTHON" <<'PY'
+          import os
+          import pathlib
+          import re
+          import sys
+
+          app_version = os.environ['APP_VERSION']
+          if not app_version:
+              sys.exit('APP_VERSION is required')
+
+          cargo_toml = pathlib.Path('Cargo.toml')
+          lines = cargo_toml.read_text().splitlines(keepends=True)
+          in_package = False
+          patched = False
+          for index, line in enumerate(lines):
+              stripped = line.strip()
+              if stripped == '[package]':
+                  in_package = True
+                  continue
+              if stripped.startswith('[') and stripped.endswith(']'):
+                  in_package = False
+              if in_package and re.fullmatch(r'version\s*=\s*"[^"]+"\s*', stripped):
+                  lines[index] = f'version = "{app_version}"\n'
+                  patched = True
+                  break
+          if not patched:
+              sys.exit('Could not patch [package] version in Cargo.toml')
+          cargo_toml.write_text(''.join(lines))
+
+          cargo_lock = pathlib.Path('Cargo.lock')
+          lock_text = cargo_lock.read_text()
+          lock_text, count = re.subn(
+              r'(?m)(^\[\[package\]\]\nname = "unsloth-studio"\nversion = ")[^"]+(")',
+              lambda match: f'{match.group(1)}{app_version}{match.group(2)}',
+              lock_text,
+          )
+          if count != 1:
+              sys.exit(f'Could not patch unsloth-studio version in Cargo.lock (matches={count})')
+          cargo_lock.write_text(lock_text)
+          PY
+
+          cargo metadata --locked --no-deps --format-version 1 > "$RUNNER_TEMP/cargo-metadata.json"
+          "$PYTHON" <<'PY'
+          import json
+          import os
+          import pathlib
+          import sys
+
+          app_version = os.environ['APP_VERSION']
+          metadata = json.loads(pathlib.Path(os.environ['RUNNER_TEMP'], 'cargo-metadata.json').read_text())
+          versions = [package['version'] for package in metadata.get('packages', []) if package.get('name') == 'unsloth-studio']
+          if versions != [app_version]:
+              sys.exit(f'cargo metadata unsloth-studio version mismatch: expected {app_version}, got {versions}')
+          PY
+
+          git diff -- Cargo.toml Cargo.lock
+
+      - name: Rust cache
+        uses: swatinem/rust-cache@e18b497796c12c097a38f9edb9d0641fb99eee32
+        with:
+          workspaces: 'studio/src-tauri -> target'
+
+      # ── macOS: import signing certificate ──
+      - name: Import Apple certificate
+        if: matrix.platform == 'macos-latest'
+        env:
+          APPLE_CERTIFICATE: ${{ secrets.APPLE_CERTIFICATE }}
+          APPLE_CERTIFICATE_PASSWORD: ${{ secrets.APPLE_CERTIFICATE_PASSWORD }}
+          KEYCHAIN_PASSWORD: ${{ secrets.KEYCHAIN_PASSWORD }}
+        run: |
+          echo $APPLE_CERTIFICATE | base64 --decode > certificate.p12
+          security create-keychain -p "$KEYCHAIN_PASSWORD" build.keychain
+          security default-keychain -s build.keychain
+          security unlock-keychain -p "$KEYCHAIN_PASSWORD" build.keychain
+          security set-keychain-settings -t 3600 -u build.keychain
+          security import certificate.p12 -k build.keychain -P "$APPLE_CERTIFICATE_PASSWORD" -T /usr/bin/codesign
+          security set-key-partition-list -S apple-tool:,apple:,codesign: -s -k "$KEYCHAIN_PASSWORD" build.keychain
+          security find-identity -v -p codesigning build.keychain
+          rm -f certificate.p12
+
+      # ── Windows: install Azure Trusted Signing CLI ──
+      - name: Install trusted-signing-cli
+        if: matrix.platform == 'windows-latest'
+        run: |
+          cargo install trusted-signing-cli --version 0.10.0 --locked
+          echo "$env:USERPROFILE\.cargo\bin" | Out-File -FilePath $env:GITHUB_PATH -Encoding utf8 -Append
+
+      # ── Windows: verify signing CLI is accessible ──
+      - name: Verify trusted-signing-cli
+        if: matrix.platform == 'windows-latest'
+        run: |
+          Write-Output "PATH: $env:PATH"
+          Get-Command trusted-signing-cli -ErrorAction SilentlyContinue || Write-Output "trusted-signing-cli NOT in PATH"
+          trusted-signing-cli --version || Write-Output "trusted-signing-cli failed to run"
+
+      # ── Linux: pin AppImage packaging toolchain ──
+      - name: Pin linuxdeploy for AppImage
+        if: matrix.platform == 'ubuntu-22.04'
+        shell: bash
+        env:
+          # Pinning the versioned release path is reproducibility, not
+          # integrity: a GitHub release asset can be replaced (or its delivery
+          # path compromised) after upload. The SHA-256 below is the immutable
+          # digest of this exact asset and is the integrity gate. If linuxdeploy
+          # publishes a new build under this tag, this run fails closed and the
+          # digest must be re-pinned deliberately.
+          LINUXDEPLOY_URL: "https://github.com/linuxdeploy/linuxdeploy/releases/download/1-alpha-20250213-2/linuxdeploy-x86_64.AppImage"
+          LINUXDEPLOY_SHA256: "4648f278ab3ef31f819e67c30d50f462640e5365a77637d7e6f2ad9fd0b4522a"
+        run: |
+          set -euo pipefail
+          tools_dir="$RUNNER_TEMP/tauri-tools-cache/tauri"
+          mkdir -p "$tools_dir"
+          dest="$tools_dir/linuxdeploy-x86_64.AppImage"
+          curl -fsSL "$LINUXDEPLOY_URL" -o "$dest"
+          # Verify the digest BEFORE the binary is ever marked executable. The
+          # next step builds the AppImage with the Tauri signing key and a
+          # contents:write GITHUB_TOKEN in scope, so a substituted linuxdeploy
+          # that ran here could exfiltrate signing material or tamper with
+          # published release artifacts. Fail closed on any mismatch.
+          echo "${LINUXDEPLOY_SHA256}  ${dest}" | sha256sum -c -
+          chmod +x "$dest"
+
+      # ── Linux: build + sign + upload ──
+      - name: Build Linux app
+        if: matrix.platform == 'ubuntu-22.04'
+        uses: tauri-apps/tauri-action@84b9d35b5fc46c1e45415bdb6144030364f7ebc5
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          TAURI_SIGNING_PRIVATE_KEY: ${{ secrets.TAURI_SIGNING_PRIVATE_KEY }}
+          TAURI_SIGNING_PRIVATE_KEY_PASSWORD: ${{ secrets.TAURI_SIGNING_PRIVATE_KEY_PASSWORD }}
+          XDG_CACHE_HOME: ${{ runner.temp }}/tauri-tools-cache
+        with:
+          projectPath: studio
+          tauriScript: npx --prefix . tauri
+          tagName: ${{ needs.prepare-version.outputs.desktop_release_tag }}
+          releaseName: 'Unsloth Studio (Desktop) ${{ needs.prepare-version.outputs.studio_version }}'
+          releaseBody: |
+            Desktop app for Unsloth Studio.
+
+            **macOS**: Download the Apple Silicon `.dmg`.
+            **Windows**: Download the `-setup.exe` installer.
+            **Linux**: Download `.deb` for Ubuntu/Debian. `.AppImage` is experimental.
+
+            > Linux in-app updates are AppImage-oriented. Package installs should update by downloading a new package.
+            > Linux AppImage can show a blank window on some Tauri/WebKitGTK + Wayland/Mesa stacks; use `.deb` when available.
+            > Linux AppImage on Ubuntu 24.04+ may require: `sudo apt install libfuse2t64`
+            > First-run system dependency elevation is supported on Ubuntu/Debian. Other Linux distributions should install system packages manually.
+          releaseDraft: ${{ inputs.draft }}
+          prerelease: ${{ needs.prepare-version.outputs.prerelease }}
+          args: -v ${{ matrix.args }}
+
+      # ── macOS: build + sign + notarize + upload ──
+      - name: Build macOS app
+        if: matrix.platform == 'macos-latest'
+        uses: tauri-apps/tauri-action@84b9d35b5fc46c1e45415bdb6144030364f7ebc5
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          TAURI_SIGNING_PRIVATE_KEY: ${{ secrets.TAURI_SIGNING_PRIVATE_KEY }}
+          TAURI_SIGNING_PRIVATE_KEY_PASSWORD: ${{ secrets.TAURI_SIGNING_PRIVATE_KEY_PASSWORD }}
+          APPLE_SIGNING_IDENTITY: ${{ secrets.APPLE_SIGNING_IDENTITY }}
+          APPLE_ID: ${{ secrets.APPLE_ID }}
+          APPLE_PASSWORD: ${{ secrets.APPLE_PASSWORD }}
+          APPLE_TEAM_ID: ${{ secrets.APPLE_TEAM_ID }}
+        with:
+          projectPath: studio
+          tauriScript: npx --prefix . tauri
+          tagName: ${{ needs.prepare-version.outputs.desktop_release_tag }}
+          releaseName: 'Unsloth Studio (Desktop) ${{ needs.prepare-version.outputs.studio_version }}'
+          releaseBody: |
+            Desktop app for Unsloth Studio.
+
+            **macOS**: Download the Apple Silicon `.dmg`.
+            **Windows**: Download the `-setup.exe` installer.
+            **Linux**: Download `.deb` for Ubuntu/Debian. `.AppImage` is experimental.
+
+            > Linux in-app updates are AppImage-oriented. Package installs should update by downloading a new package.
+            > Linux AppImage can show a blank window on some Tauri/WebKitGTK + Wayland/Mesa stacks; use `.deb` when available.
+            > Linux AppImage on Ubuntu 24.04+ may require: `sudo apt install libfuse2t64`
+            > First-run system dependency elevation is supported on Ubuntu/Debian. Other Linux distributions should install system packages manually.
+          releaseDraft: ${{ inputs.draft }}
+          prerelease: ${{ needs.prepare-version.outputs.prerelease }}
+          args: -v ${{ matrix.args }}
+
+      # ── Windows: build + sign + upload ──
+      - name: Build Windows app
+        if: matrix.platform == 'windows-latest'
+        uses: tauri-apps/tauri-action@84b9d35b5fc46c1e45415bdb6144030364f7ebc5
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          TAURI_SIGNING_PRIVATE_KEY: ${{ secrets.TAURI_SIGNING_PRIVATE_KEY }}
+          TAURI_SIGNING_PRIVATE_KEY_PASSWORD: ${{ secrets.TAURI_SIGNING_PRIVATE_KEY_PASSWORD }}
+          AZURE_CLIENT_ID: ${{ secrets.AZURE_CLIENT_ID }}
+          AZURE_CLIENT_SECRET: ${{ secrets.AZURE_CLIENT_SECRET }}
+          AZURE_TENANT_ID: ${{ secrets.AZURE_TENANT_ID }}
+          AZURE_TRUSTED_SIGNING_ACCOUNT_NAME: ${{ secrets.AZURE_TRUSTED_SIGNING_ACCOUNT_NAME }}
+          AZURE_CERTIFICATE_PROFILE_NAME: ${{ secrets.AZURE_CERTIFICATE_PROFILE_NAME }}
+        with:
+          projectPath: studio
+          tauriScript: npx --prefix . tauri
+          tagName: ${{ needs.prepare-version.outputs.desktop_release_tag }}
+          releaseName: 'Unsloth Studio (Desktop) ${{ needs.prepare-version.outputs.studio_version }}'
+          releaseBody: |
+            Desktop app for Unsloth Studio.
+
+            **macOS**: Download the Apple Silicon `.dmg`.
+            **Windows**: Download the `-setup.exe` installer.
+            **Linux**: Download `.deb` for Ubuntu/Debian. `.AppImage` is experimental.
+
+            > Linux in-app updates are AppImage-oriented. Package installs should update by downloading a new package.
+            > Linux AppImage can show a blank window on some Tauri/WebKitGTK + Wayland/Mesa stacks; use `.deb` when available.
+            > Linux AppImage on Ubuntu 24.04+ may require: `sudo apt install libfuse2t64`
+            > First-run system dependency elevation is supported on Ubuntu/Debian. Other Linux distributions should install system packages manually.
+          releaseDraft: ${{ inputs.draft }}
+          prerelease: ${{ needs.prepare-version.outputs.prerelease }}
+          args: -v ${{ matrix.args }}
+
+  # Release process note: only non-draft workflow runs advance the public
+  # desktop-latest updater channel. Draft builds are for private review; if a
+  # draft is manually published later, this channel intentionally remains
+  # unchanged until a narrow manual channel-publish flow is added or a public
+  # desktop release is created by running this workflow with draft=false.
+  publish-updater-channel:
+    name: Publish desktop updater channel
+    needs: [prepare-version, build]
+    if: ${{ !inputs.draft }}
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+    env:
+      GH_REPO: ${{ github.repository }}
+      APP_VERSION: ${{ needs.prepare-version.outputs.app_version }}
+      STUDIO_VERSION: ${{ needs.prepare-version.outputs.studio_version }}
+      DESKTOP_RELEASE_TAG: ${{ needs.prepare-version.outputs.desktop_release_tag }}
+      DESKTOP_PRERELEASE: ${{ needs.prepare-version.outputs.prerelease }}
+
+    steps:
+      - name: Download versioned updater metadata
+        shell: bash
+        env:
+          GH_TOKEN: ${{ github.token }}
+        run: |
+          set -euo pipefail
+          mkdir -p "$RUNNER_TEMP/desktop-updater"
+          gh api "repos/${GITHUB_REPOSITORY}/releases/tags/${DESKTOP_RELEASE_TAG}" > "$RUNNER_TEMP/source-release.json"
+          python3 <<'PY'
+          import json
+          import os
+          import pathlib
+          import sys
+
+          source = json.loads(pathlib.Path(os.environ['RUNNER_TEMP'], 'source-release.json').read_text())
+          expected_tag = os.environ['DESKTOP_RELEASE_TAG']
+          if source.get('tag_name') != expected_tag:
+              sys.exit(f'Expected source release {expected_tag}, got {source.get("tag_name")}')
+          if source.get('draft'):
+              sys.exit(f'Source desktop release {expected_tag} is draft; refusing to publish public updater channel')
+          PY
+          gh release download "$DESKTOP_RELEASE_TAG" --pattern latest.json --dir "$RUNNER_TEMP/desktop-updater" --clobber
+          test -s "$RUNNER_TEMP/desktop-updater/latest.json"
+
+      - name: Validate versioned updater metadata
+        shell: bash
+        run: |
+          python3 <<'PY'
+          import json
+          import os
+          import pathlib
+          import re
+          import sys
+
+          app_version = os.environ['APP_VERSION']
+          release_tag = os.environ['DESKTOP_RELEASE_TAG']
+          latest_path = pathlib.Path(os.environ['RUNNER_TEMP'], 'desktop-updater', 'latest.json')
+          data = json.loads(latest_path.read_text())
+          if not isinstance(data, dict):
+              sys.exit('latest.json must be a JSON object')
+
+          version = data.get('version')
+          if not isinstance(version, str) or not version:
+              sys.exit('latest.json missing version')
+          if not re.fullmatch(r'v?\d+\.\d+\.\d+(?:[-+][0-9A-Za-z.-]+)?', version):
+              sys.exit(f'latest.json version is not SemVer-like: {version}')
+          if version.removeprefix('v') != app_version:
+              sys.exit(f'latest.json version {version} does not match desktop app version {app_version}')
+
+          platforms = data.get('platforms')
+          if not isinstance(platforms, dict) or not platforms:
+              sys.exit('latest.json missing platforms')
+
+          required_families = {
+              'darwin-aarch64': False,
+              'linux-x86_64': False,
+              'windows-x86_64': False,
+          }
+          expected_prefix = f'https://github.com/unslothai/unsloth/releases/download/{release_tag}/'
+          forbidden_fragments = ('/releases/latest/', '/releases/download/desktop-latest/')
+
+          for platform, entry in platforms.items():
+              if not isinstance(entry, dict):
+                  sys.exit(f'Platform {platform} must be an object')
+              url = entry.get('url')
+              signature = entry.get('signature')
+              if not isinstance(url, str) or not url.strip():
+                  sys.exit(f'Platform {platform} missing url')
+              if not isinstance(signature, str) or not signature.strip():
+                  sys.exit(f'Platform {platform} missing signature')
+              if any(fragment in url for fragment in forbidden_fragments):
+                  sys.exit(f'Platform {platform} points at a moving updater channel: {url}')
+              if not url.startswith(expected_prefix):
+                  sys.exit(f'Platform {platform} URL must point at {release_tag}: {url}')
+              for family in required_families:
+                  if platform == family or platform.startswith(family + '-'):
+                      required_families[family] = True
+
+          missing = [family for family, found in required_families.items() if not found]
+          if missing:
+              sys.exit('latest.json missing required platform families: ' + ', '.join(missing))
+          PY
+
+      - name: Ensure desktop updater channel release
+        shell: bash
+        env:
+          GH_TOKEN: ${{ github.token }}
+        run: |
+          set -euo pipefail
+          channel_json="$RUNNER_TEMP/desktop-latest-release.json"
+          if ! gh api "repos/${GITHUB_REPOSITORY}/releases/tags/desktop-latest" > "$channel_json" 2>/dev/null; then
+            gh release create desktop-latest \
+              --title "Unsloth Studio Desktop updater channel" \
+              --notes "Machine-managed desktop updater channel; latest.json is replaced by release-desktop.yml." \
+              --prerelease \
+              --latest=false \
+              --target "$GITHUB_SHA"
+            gh api "repos/${GITHUB_REPOSITORY}/releases/tags/desktop-latest" > "$channel_json"
+          fi
+
+          python3 <<'PY'
+          import json
+          import os
+          import pathlib
+          import sys
+
+          channel = json.loads(pathlib.Path(os.environ['RUNNER_TEMP'], 'desktop-latest-release.json').read_text())
+          if channel.get('draft'):
+              sys.exit('desktop-latest release is draft; refusing to publish updater channel')
+          if channel.get('immutable'):
+              sys.exit('desktop-latest release is immutable; cannot replace latest.json')
+          if not channel.get('prerelease'):
+              sys.exit('desktop-latest release must be a prerelease so it cannot compete with repo-wide latest')
+          PY
+
+      - name: Prevent updater channel downgrade
+        shell: bash
+        env:
+          GH_TOKEN: ${{ github.token }}
+        run: |
+          set -euo pipefail
+          mkdir -p "$RUNNER_TEMP/desktop-current"
+          if ! gh release download desktop-latest --pattern latest.json --dir "$RUNNER_TEMP/desktop-current" --clobber 2>/dev/null; then
+            echo "No existing desktop-latest latest.json found; allowing first channel publish."
+            exit 0
+          fi
+          python3 <<'PY'
+          import json
+          import os
+          import pathlib
+          import re
+          import sys
+
+          def parse(value: str):
+              value = value.removeprefix('v')
+              match = re.fullmatch(
+                  r'(0|[1-9]\d*)\.(0|[1-9]\d*)\.(0|[1-9]\d*)'
+                  r'(?:-([0-9A-Za-z-]+(?:\.[0-9A-Za-z-]+)*))?'
+                  r'(?:\+[0-9A-Za-z-]+(?:\.[0-9A-Za-z-]+)*)?',
+                  value,
+              )
+              if not match:
+                  sys.exit(f'desktop-latest latest.json has invalid version: {value}')
+              major, minor, patch, prerelease = match.groups()
+              return (int(major), int(minor), int(patch), prerelease)
+
+          def numeric_tail(identifier: str) -> tuple[str, int] | None:
+              match = re.fullmatch(r'([A-Za-z-]+)(\d+)', identifier)
+              if not match:
+                  return None
+              return (match.group(1).lower(), int(match.group(2)))
+
+          def compare_identifier(left: str, right: str) -> int:
+              left_num = left.isdigit()
+              right_num = right.isdigit()
+              if left_num and right_num:
+                  return (int(left) > int(right)) - (int(left) < int(right))
+              if left_num:
+                  return -1
+              if right_num:
+                  return 1
+
+              left_tail = numeric_tail(left)
+              right_tail = numeric_tail(right)
+              if left_tail and right_tail and left_tail[0] == right_tail[0]:
+                  return (left_tail[1] > right_tail[1]) - (left_tail[1] < right_tail[1])
+
+              return (left > right) - (left < right)
+
+          def compare_prerelease(left: str | None, right: str | None) -> int:
+              if left == right:
+                  return 0
+              if left is None:
+                  return 1
+              if right is None:
+                  return -1
+              left_parts = left.split('.')
+              right_parts = right.split('.')
+              for left_part, right_part in zip(left_parts, right_parts):
+                  order = compare_identifier(left_part, right_part)
+                  if order:
+                      return order
+              return (len(left_parts) > len(right_parts)) - (len(left_parts) < len(right_parts))
+
+          def compare(left: str, right: str) -> int:
+              left_major, left_minor, left_patch, left_pre = parse(left)
+              right_major, right_minor, right_patch, right_pre = parse(right)
+              left_core = (left_major, left_minor, left_patch)
+              right_core = (right_major, right_minor, right_patch)
+              if left_core != right_core:
+                  return (left_core > right_core) - (left_core < right_core)
+              return compare_prerelease(left_pre, right_pre)
+
+          current_path = pathlib.Path(os.environ['RUNNER_TEMP'], 'desktop-current', 'latest.json')
+          next_path = pathlib.Path(os.environ['RUNNER_TEMP'], 'desktop-updater', 'latest.json')
+          current = json.loads(current_path.read_text()).get('version')
+          next_version = json.loads(next_path.read_text()).get('version')
+          if not isinstance(current, str) or not isinstance(next_version, str):
+              sys.exit('Could not compare desktop-latest channel versions')
+          if compare(next_version, current) < 0:
+              sys.exit(
+                  f'Refusing to move desktop-latest from {current} to older version {next_version}.'
+              )
+          PY
+
+      - name: Publish desktop updater channel metadata
+        shell: bash
+        env:
+          GH_TOKEN: ${{ github.token }}
+        run: |
+          set -euo pipefail
+          gh release upload desktop-latest "$RUNNER_TEMP/desktop-updater/latest.json" --clobber
+          gh api "repos/${GITHUB_REPOSITORY}/releases/tags/desktop-latest" > "$RUNNER_TEMP/desktop-latest-release.json"
+          python3 <<'PY'
+          import json
+          import os
+          import pathlib
+          import sys
+
+          channel = json.loads(pathlib.Path(os.environ['RUNNER_TEMP'], 'desktop-latest-release.json').read_text())
+          assets = [asset for asset in channel.get('assets', []) if asset.get('name') == 'latest.json']
+          if len(assets) != 1:
+              sys.exit(f'Expected exactly one desktop-latest latest.json asset, found {len(assets)}')
+          expected_url = f'https://github.com/{os.environ["GITHUB_REPOSITORY"]}/releases/download/desktop-latest/latest.json'
+          actual_url = assets[0].get('browser_download_url')
+          if actual_url != expected_url:
+              sys.exit(f'desktop-latest latest.json URL mismatch: expected {expected_url}, got {actual_url}')
+          PY
@@ -0,0 +1,37 @@
+name: 'Inactive Issue Pinger'
+
+on:
+  schedule:
+    - cron: '30 5 * * *' # Runs at 5:30 UTC every day
+
+jobs:
+  stale:
+    runs-on: ubuntu-latest
+    permissions:
+      issues: write
+
+    steps:
+      - uses: actions/stale@b5d41d4e1d5dceea10e7104786b73624c18a190f  # v10.2.0
+        with:
+          # The message to post on stale issues.
+          # This message will ping the issue author.
+          # Note: The stale bot action does not currently support a direct placeholder for the last commenter.
+          # As a workaround, this message encourages any participant to reply.
+          stale-issue-message: >
+            Is this issue still important to you?
+            Apologies in advance we might have missed this issue as well.
+            For faster response times, please post on our Reddit server - https://www.reddit.com/r/unsloth or our Discord - https://discord.com/invite/unsloth 
+
+          # The number of days of inactivity before an issue is considered stale.
+          days-before-issue-stale: 9999
+
+          # Set to -1 to never close stale issues.
+          days-before-issue-close: -1
+
+          # A label to apply to stale issues.
+          stale-issue-label: 'inactive'
+
+          # The number of operations to perform per run to avoid rate limiting.
+          operations-per-run: 500
+
+          enable-statistics: false
@@ -0,0 +1,170 @@
+# SPDX-License-Identifier: AGPL-3.0-only
+# Copyright 2026-present the Unsloth AI Inc. team. All rights reserved.
+
+# Studio API & Auth Tests -- HTTP-level integration tests for the
+# FastAPI surface. No Playwright, no model UI; tests/studio/test_studio_api_smoke.py
+# runs ~30 s and asserts:
+#   - CORS hardening (no wildcard + credentials, no bootstrap leak)
+#   - /api/system + /api/system/hardware require auth
+#   - Auth state machine + JWT expiry
+#   - API key lifecycle E2E (create / list / use / delete / reject)
+#   - Auth file-mode hardening (Linux only)
+#   - Inference lifecycle (force reload, bogus variant, /v1/models, /v1/embeddings, /v1/responses)
+#   - Endpoint-by-endpoint auth audit
+#
+# Reuses the GGUF cache key from studio-ui-smoke.yml so the model
+# download is one cache-hit on the second job.
+
+name: Studio API CI
+
+on:
+  pull_request:
+    paths:
+      - 'studio/**'
+      - 'unsloth/**'
+      - 'unsloth_cli/**'
+      - 'install.sh'
+      - 'pyproject.toml'
+      - 'tests/studio/**'
+      - '.github/workflows/studio-api-smoke.yml'
+  push:
+    branches: [main, pip]
+  workflow_dispatch:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+jobs:
+  api-smoke:
+    name: Studio API & Auth Tests
+    runs-on: ubuntu-latest
+    timeout-minutes: 12
+    env:
+      GGUF_REPO: unsloth/gemma-3-270m-it-GGUF
+      GGUF_VARIANT: UD-Q4_K_XL
+      GGUF_FILE: gemma-3-270m-it-UD-Q4_K_XL.gguf
+      STUDIO_PORT: '18893'
+      HF_HOME: ${{ github.workspace }}/hf-cache
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
+
+      - name: Linux deps
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y --no-install-recommends \
+            libcurl4-openssl-dev libssl-dev jq
+
+      - uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e  # v6.4.0
+        with:
+          node-version: '22'
+
+      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
+        with:
+          python-version: '3.12'
+          cache: 'pip'
+
+      - name: Restore HF_HOME for ${{ env.GGUF_REPO }}
+        id: cache-hf
+        uses: actions/cache/restore@27d5ce7f107fe9357f9df03efb73ab90386fccae  # v5.0.5
+        continue-on-error: true
+        with:
+          path: hf-cache
+          # Same key as studio-ui-smoke.yml so the two jobs share a
+          # single GGUF download across CI.
+          key: ${{ runner.os }}-hf-${{ env.GGUF_REPO }}-${{ env.GGUF_VARIANT }}-v2
+
+      - name: Prime HF_HOME with the GGUF
+        id: prime-hf
+        if: steps.cache-hf.outputs.cache-hit != 'true' || steps.cache-hf.outcome != 'success'
+        env:
+          # Withheld on PR: this step runs checked-out PR code; public GGUF still downloads.
+          HF_TOKEN: ${{ github.event_name != 'pull_request' && secrets.HF_TOKEN || '' }}
+        run: |
+          python -m pip install --upgrade huggingface_hub
+          mkdir -p hf-cache
+          bash .github/scripts/hf-download-with-retry.sh "$GGUF_REPO" "$GGUF_FILE"
+          bash .github/scripts/hf-download-with-retry.sh ggml-org/models tinyllamas/stories260K.gguf
+
+      - name: Save HF_HOME for ${{ env.GGUF_REPO }}
+        if: always() && steps.prime-hf.outcome == 'success'
+        uses: actions/cache/save@27d5ce7f107fe9357f9df03efb73ab90386fccae  # v5.0.5
+        with:
+          path: hf-cache
+          key: ${{ runner.os }}-hf-${{ env.GGUF_REPO }}-${{ env.GGUF_VARIANT }}-v2
+
+      - name: Install Studio (--local, --no-torch)
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          # Withheld on PR: this step runs checked-out PR code; public GGUF still downloads.
+          HF_TOKEN: ${{ github.event_name != 'pull_request' && secrets.HF_TOKEN || '' }}
+        run: |
+          mkdir -p logs
+          set -o pipefail
+          bash install.sh --local --no-torch 2>&1 | tee logs/install.log
+
+      - name: Install pyjwt for the JWT-expiry forge test
+        run: pip install 'pyjwt>=2.6'
+
+      - name: Reset auth + boot Studio (API-only)
+        run: |
+          unsloth studio reset-password
+          mkdir -p logs
+          UNSLOTH_API_ONLY=1 unsloth studio -H 127.0.0.1 -p "$STUDIO_PORT" \
+            > logs/studio.log 2>&1 &
+          echo "STUDIO_PID=$!" >> "$GITHUB_ENV"
+
+      - name: Wait for /api/health
+        run: |
+          for i in $(seq 1 180); do
+            if curl -fs "http://127.0.0.1:${STUDIO_PORT}/api/health" > /tmp/health.json; then
+              jq -e '.status == "healthy"' /tmp/health.json && break
+            fi
+            sleep 1
+          done
+          jq -e '.status == "healthy"' /tmp/health.json
+
+      - name: Pass bootstrap password + rotated targets to the test
+        # The test does its own bootstrap-login + rotation to exercise
+        # the auth state machine; we just pre-mint two random rotated
+        # passwords for it. Mask them so the log is clean.
+        run: |
+          OLD=$(cat ~/.unsloth/studio/auth/.bootstrap_password)
+          NEW="ApiSmoke-$(python -c 'import secrets; print(secrets.token_urlsafe(16))')"
+          NEW2="ApiSmoke-$(python -c 'import secrets; print(secrets.token_urlsafe(16))')"
+          echo "::add-mask::$OLD"
+          echo "::add-mask::$NEW"
+          echo "::add-mask::$NEW2"
+          echo "STUDIO_OLD_PW=$OLD"  >> "$GITHUB_ENV"
+          echo "STUDIO_NEW_PW=$NEW"  >> "$GITHUB_ENV"
+          echo "STUDIO_NEW2_PW=$NEW2" >> "$GITHUB_ENV"
+
+      - name: Run Studio API & Auth tests
+        # The script is named WITHOUT a `test_` prefix so it isn't
+        # auto-collected by pytest in Backend CI's `tests/` walk
+        # (which doesn't set BASE_URL and would crash at import).
+        env:
+          BASE_URL: http://127.0.0.1:18893
+          STUDIO_AUTH_DIR: /home/runner/.unsloth/studio/auth
+        run: python tests/studio/studio_api_smoke.py
+
+      - name: Stop Studio
+        if: always()
+        run: |
+          kill "${STUDIO_PID}" 2>/dev/null || true
+          sleep 2
+
+      - name: Upload API smoke logs
+        if: always()
+        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
+        with:
+          name: studio-api-smoke-log
+          path: |
+            logs/install.log
+            logs/studio.log
+          retention-days: 7
@@ -0,0 +1,240 @@
+# SPDX-License-Identifier: AGPL-3.0-only
+# Copyright 2026-present the Unsloth AI Inc. team. All rights reserved.
+
+# Runs the existing studio/backend/tests/ suite (~860 tests, all CPU-friendly)
+# on every PR that touches the backend or unsloth library. Until this lands,
+# none of those tests run automatically. Verified locally on Python 3.13 with
+# the surgical exclusions below: 861 pass, 4 skipped.
+#
+# Exclusions:
+#   - tests/test_studio_api.py: end-to-end against a live model + GGUF download,
+#     too heavy for free runners. Run separately when GPU CI is available.
+#   - -k 'not llama_cpp_load_progress_live': spawns a real llama.cpp process,
+#     not appropriate for CPU-only runners.
+#
+# Two jobs:
+#   - pytest matrix (3.10/3.11/3.12/3.13) over studio/backend/tests
+#   - repo-cpu-tests: auto-discovered tests/ + state-isolated spoof files
+#
+# Whole-repo Python lint (syntax + ruff + debugger-leftover scan)
+# moved to the dedicated `Lint CI` workflow (.github/workflows/lint-ci.yml)
+# so it fires on every PR rather than only on studio/unsloth/tests
+# path changes.
+
+name: Backend CI
+
+on:
+  pull_request:
+    paths:
+      - 'studio/**'
+      - 'unsloth/**'
+      - 'unsloth_cli/**'
+      - 'tests/**'
+      - 'pyproject.toml'
+      - '.github/workflows/studio-backend-ci.yml'
+  push:
+    branches: [main, pip]
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+jobs:
+  pytest:
+    name: (Python ${{ matrix.python }})
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+    strategy:
+      fail-fast: false
+      matrix:
+        python: ['3.10', '3.11', '3.12', '3.13']
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
+
+      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
+        with:
+          python-version: '${{ matrix.python }}'
+          cache: 'pip'
+
+      - name: Install backend test dependencies (CPU only)
+        run: |
+          python -m pip install --upgrade pip
+          # Studio's declared backend deps:
+          pip install -r studio/backend/requirements/studio.txt
+          # Extras that studio.txt does not list but the import chain needs
+          # (python-multipart for FastAPI form/file uploads, sqlalchemy/cryptography
+          #  for the auth DB, yaml/jinja2 for utils.models.model_config, psutil for
+          #  the orphan-cleanup process scan, etc.):
+          pip install \
+            python-multipart aiofiles sqlalchemy cryptography psutil \
+            pyyaml jinja2 mammoth unpdf requests \
+            'numpy<3' pytest pytest-asyncio httpx
+          # Torch CPU + transformers are required by a chunk of the backend test
+          # suite (gpu_selection, kv_cache_estimation, utils). CPU-only torch
+          # keeps the install ~250 MB / ~1 min on a clean runner.
+          pip install --index-url https://download.pytorch.org/whl/cpu --extra-index-url https://pypi.org/simple 'torch>=2.4,<2.11'
+          pip install 'transformers>=4.51,<5.5'
+
+      - name: Backend tests
+        working-directory: studio/backend
+        # Locally validated against this dep set: 831 passed, 5 skipped, 35 deselected.
+        # Deselections (all environment-specific, would never pass on a GPU-less
+        # `ubuntu-latest` runner regardless of code correctness):
+        #   - llama_cpp_load_progress_live: spawns a real llama.cpp process
+        #   - TestGpuAutoSelection / TestPreSpawnGpuResolution / TestPerGpuFitGuardAllCounts:
+        #       require live transformers config introspection on real GPUs
+        #   - TestTransformersIntrospection: same
+        #   - test_returns_cuda_when_cuda_available / test_calls_cuda_cache_when_cuda:
+        #       assume CUDA-capable GPU
+        run: |
+          python -m pytest tests/ -q --tb=short \
+            --ignore=tests/test_studio_api.py \
+            -k 'not llama_cpp_load_progress_live and not TestGpuAutoSelection and not TestPreSpawnGpuResolution and not TestPerGpuFitGuardAllCounts and not TestTransformersIntrospection and not test_returns_cuda_when_cuda_available and not test_calls_cuda_cache_when_cuda'
+
+  repo-cpu-tests:
+    # Auto-discover everything under tests/ that is not GPU-bound by
+    # design. New tests added in covered directories are picked up
+    # without a workflow edit. Locally validated: 760 passed, 1 skipped,
+    # 23 deselected. tests/conftest.py (mirroring unsloth-zoo PR #624)
+    # pre-loads unsloth_zoo.device_type and unsloth.device_type under a
+    # mocked torch.cuda.is_available so the unsloth import chain
+    # succeeds on CPU.
+    name: Repo tests (CPU)
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
+
+      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
+        with:
+          python-version: '3.12'
+          cache: 'pip'
+
+      # node + uv unlock ~60 tests that previously skipped on CI:
+      #   - 9 tests in test_chat_preset_builtin_invariants.py need node to
+      #     compile a tiny TS harness against the frontend chat sources.
+      #   - tests/python/* spawn fresh `uv venv`s to verify the no-torch
+      #     install path; they self-skip when uv is missing.
+      - uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e  # v6.4.0
+        with:
+          node-version: '22'
+
+      - name: Install uv (for tests/python/* sandboxed venvs)
+        run: pip install uv
+
+      - name: Install deps (shared shape with backend pytest job)
+        run: |
+          python -m pip install --upgrade pip
+          pip install -r studio/backend/requirements/studio.txt
+          pip install \
+            python-multipart aiofiles sqlalchemy cryptography psutil \
+            pyyaml jinja2 mammoth unpdf requests typer \
+            'numpy<3' pytest pytest-asyncio httpx
+          # torchvision: unsloth_zoo.vision_utils imports it at module scope.
+          pip install --index-url https://download.pytorch.org/whl/cpu --extra-index-url https://pypi.org/simple \
+            'torch>=2.4,<2.11' 'torchvision<0.26'
+          pip install 'transformers>=4.51,<5.5'
+          # bitsandbytes: hard import in unsloth/models/_utils.py. Recent
+          # versions ship a CPU build that imports cleanly on Linux.
+          pip install 'bitsandbytes>=0.45'
+          # unsloth.device_type imports unsloth_zoo.utils.Version at module
+          # scope, so the conftest preload needs unsloth_zoo. Pull from
+          # git main so this job sees the same zoo HEAD as Core / MLX /
+          # install.sh do (otherwise a fix on zoo main hides until release).
+          # No --no-deps: matches prior `pip install 'unsloth_zoo>=2026.5.1'`
+          # behaviour so triton etc. still come in for the Repo tests CPU
+          # collection imports.
+          for attempt in 1 2 3; do
+            if pip install "unsloth_zoo @ git+https://github.com/unslothai/unsloth-zoo"; then
+              break
+            fi
+            [ "$attempt" -eq 3 ] && { echo "::error::unsloth_zoo install failed after 3 attempts"; exit 1; }
+            sleep $((5 * attempt))
+          done
+          pip install -e . --no-deps
+
+      - name: Repo tests (CPU, auto-discovered)
+        env:
+          # tests/python/* import install_python_stack from studio/.
+          PYTHONPATH: ${{ github.workspace }}/studio
+          # Skip lazy compilation work the unsloth import chain wants to
+          # do at import time on a real GPU.
+          UNSLOTH_COMPILE_DISABLE: '1'
+        # --ignore: GPU-bound directories (qlora/saving need real weights;
+        #   tests/sh is the shell suite the next step handles; tests/utils
+        #   is a helpers folder); tests/vllm_compat + tests/version_compat
+        #   are dedicated multi-version drift canaries with their own job
+        #   in version-compat-ci.yml that installs the heavier dep set
+        #   (torchcodec, full transformers/peft/bnb pins) those tests need.
+        # State-sensitive hardware-spoofing files run in isolation in the
+        # next step because they mutate hardware.py module globals.
+        # -m: honour markers from tests/python/conftest.py (`server` =
+        #   needs studio venv, `e2e` = needs network).
+        # --deselect:
+        #   - test_model_registration / test_all_model_registration:
+        #     hit huggingface_hub for live model existence checks.
+        #   - test_autoconfig_works_with_no_torch_runtime / test_autoconfig_succeeds:
+        #     fail because no-torch-runtime.txt does not pin tokenizers
+        #     and the latest tokenizers (0.23.1) is incompatible with the
+        #     transformers it resolves to. Tracked separately; this is a
+        #     real bug in the no-torch install path, not a CI issue.
+        run: |
+          python -m pytest tests/ -q --tb=short \
+            --ignore=tests/qlora \
+            --ignore=tests/saving \
+            --ignore=tests/utils \
+            --ignore=tests/sh \
+            --ignore=tests/studio/test_hardware_dispatch_matrix.py \
+            --ignore=tests/studio/test_is_mlx_dispatch_gate.py \
+            --ignore=tests/vllm_compat \
+            --ignore=tests/version_compat \
+            -m 'not server and not e2e' \
+            --deselect tests/test_model_registry.py::test_model_registration \
+            --deselect tests/test_model_registry.py::test_all_model_registration \
+            --deselect 'tests/python/test_tokenizers_and_torch_constraint.py::TestE2ETokenizersFix::test_autoconfig_works_with_no_torch_runtime' \
+            --deselect 'tests/python/test_tokenizers_and_torch_constraint.py::TestE2EFullNoTorchSandbox::test_autoconfig_succeeds'
+
+      - name: Hardware-spoof tests (state-sensitive, run in isolation)
+        env:
+          PYTHONPATH: ${{ github.workspace }}/studio
+          UNSLOTH_COMPILE_DISABLE: '1'
+        # These two files mutate hardware.py module globals at runtime
+        # via the spoof fixtures, which leaks state into any other test
+        # that imports hardware. Run them in their own pytest invocation
+        # so the leak does not cross file boundaries.
+        run: |
+          python -m pytest -q --tb=short \
+            tests/studio/test_hardware_dispatch_matrix.py \
+            tests/studio/test_is_mlx_dispatch_gate.py
+
+      - name: Shell installer tests
+        # Subset that does not depend on a writable / pristine install.sh
+        # tree; test_install_host_defaults.sh checks install.ps1 layout
+        # which has drifted (separate followup).
+        run: |
+          set -e
+          for s in \
+              tests/sh/test_get_torch_index_url.sh \
+              tests/sh/test_mac_intel_compat.sh \
+              tests/sh/test_node_decision.sh \
+              tests/sh/test_studio_home_node_dir.sh \
+              tests/sh/test_system_node_readonly.sh \
+              tests/sh/test_nvcc_meets_llama_minimum.sh \
+              tests/sh/test_resolve_cuda_archs.sh \
+              tests/sh/test_tauri_install_exit_order.sh \
+              tests/sh/test_torch_constraint.sh \
+              tests/sh/test_torch_flavor.sh \
+              tests/sh/test_with_llama_cpp_dir_flag.sh \
+              tests/sh/test_with_llama_cpp_dir_link_behavior.sh; do
+              echo "::group::$s"
+              bash "$s"
+              echo "::endgroup::"
+          done
+
@@ -0,0 +1,76 @@
+# SPDX-License-Identifier: AGPL-3.0-only
+# Copyright 2026-present the Unsloth AI Inc. team. All rights reserved.
+
+# Runs studio/backend/tests/test_export_capability.py on Linux, Windows and macOS.
+#
+# export_capability() is per-OS (is_apple_silicon() and the PyTorch-import probe differ per
+# platform) and the export backend must import without PyTorch, so this confirms the gating and
+# import-safety on hosted Windows/macOS. Hosted runners have no GPU/MLX, so a real accelerator
+# export is validated separately. No GPU / model / llama.cpp: the tests mock the probes and block
+# torch/unsloth, so the job installs only a CPU PyTorch plus import deps.
+
+name: Studio export capability
+
+on:
+  pull_request:
+    paths:
+      - 'studio/backend/utils/hardware/hardware.py'
+      - 'studio/backend/core/export/export.py'
+      - 'studio/backend/routes/export.py'
+      - 'studio/backend/main.py'
+      - 'studio/backend/tests/test_export_capability.py'
+      - '.github/workflows/studio-export-capability-ci.yml'
+  push:
+    branches: [main]
+    paths:
+      - 'studio/backend/utils/hardware/hardware.py'
+      - 'studio/backend/core/export/export.py'
+      - 'studio/backend/routes/export.py'
+      - 'studio/backend/main.py'
+      - 'studio/backend/tests/test_export_capability.py'
+      - '.github/workflows/studio-export-capability-ci.yml'
+  workflow_dispatch:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+jobs:
+  capability:
+    name: capability (${{ matrix.os }})
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest]
+    runs-on: ${{ matrix.os }}
+    timeout-minutes: 20
+    env:
+      # No accelerator on hosted runners; keep detection on the CPU path.
+      CUDA_VISIBLE_DEVICES: ""
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
+      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
+        with:
+          python-version: '3.12'
+          cache: 'pip'
+      - name: Upgrade pip
+        run: python -m pip install --upgrade pip
+      - name: Install CPU PyTorch
+        # CPU wheel index so every OS gets a CPU build; keep PyPI as an extra index so torch's
+        # transitive deps still resolve (matching the other workflows in this repo).
+        run: python -m pip install --index-url https://download.pytorch.org/whl/cpu --extra-index-url https://pypi.org/simple "torch>=2.4,<2.13"
+      - name: Install backend import deps
+        # Enough to import utils.hardware and core.export.export; NOT unsloth (needs a GPU, and
+        # the import-safety test blocks it) or triton/llama.cpp (Linux-only / native builds).
+        run: python -m pip install
+          transformers peft accelerate safetensors huggingface_hub datasets
+          sentencepiece protobuf fastapi starlette structlog psutil
+          python-multipart pydantic httpx "numpy<3" pytest
+      - name: Export capability + import-safety tests
+        working-directory: studio/backend
+        run: python -m pytest tests/test_export_capability.py -q
@@ -0,0 +1,175 @@
+# SPDX-License-Identifier: AGPL-3.0-only
+# Copyright 2026-present the Unsloth AI Inc. team. All rights reserved.
+
+# Frontend PR gate: lockfile freshness, typecheck, build, and a bundle grep
+# that catches the 2026.5.1 chat-history regression at the JS level.
+#
+# biome runs as non-blocking for now: the codebase currently has accumulated
+# ~470 errors and ~1650 warnings against the existing biome config. Surfacing
+# the count in CI lets us drive it down without forcing a fleet-wide cleanup
+# in the same PR. Drop `continue-on-error` once that number is zero.
+
+name: Frontend CI
+
+on:
+  pull_request:
+    paths:
+      - 'studio/frontend/**'
+      - 'scripts/check_frontend_dep_removal.py'
+      - 'tests/studio/test_frontend_dep_removal.py'
+      - 'scripts/sync_allow_scripts_pins.py'
+      - 'tests/studio/test_sync_allow_scripts_pins.py'
+      - '.github/workflows/studio-frontend-ci.yml'
+  push:
+    branches: [main, pip]
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+    name: Frontend build + bundle sanity
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+    defaults:
+      run:
+        working-directory: studio/frontend
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
+
+      # FIXME: drop this step once @assistant-ui/* and assistant-stream
+      # leave 0.x -- on 1.x, caret ranges are conventional. Until then,
+      # every 0.minor on this surface is a SemVer-major (this is exactly
+      # how 2026.5.1 shipped a broken chat runtime: ^0.12.19 quietly
+      # resolved to 0.12.28).
+      - name: '@assistant-ui must be pinned exactly (no caret/tilde)'
+        working-directory: ${{ github.workspace }}
+        run: |
+          set -e
+          if grep -nE '"(@assistant-ui/[a-z-]+|assistant-stream)":[[:space:]]*"[\^~]' studio/frontend/package.json; then
+            echo "::error file=studio/frontend/package.json::These packages must be pinned to exact versions until they leave 0.x. Drop the leading ^ or ~."
+            exit 1
+          fi
+          echo "All assistant-ui packages are pinned exactly."
+
+      - uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e  # v6.4.0
+        with:
+          node-version: '22'
+
+      # node 22 bundles npm 10.x, which predates allowScripts. Move to the
+      # 11.x line and fail loudly if the gate is still missing, so the
+      # strict flag below can never silently degrade into a warning.
+      - name: Upgrade npm to 11.x (allowScripts enforcement)
+        working-directory: ${{ github.workspace }}
+        run: |
+          npm install -g npm@^11 --no-fund --no-audit
+          V=$(npm -v)
+          case "$V" in
+            11.1[6-9].*|11.[2-9][0-9].*|1[2-9].*) echo "npm $V has allowScripts" ;;
+            *) echo "::error::npm $V lacks allowScripts (need >=11.16)"; exit 1 ;;
+          esac
+
+      # Run the structural lockfile scan BEFORE npm ci. A compromised
+      # tarball runs its `prepare` / `postinstall` during `npm ci`,
+      # so any catch has to fire upstream of that. The scanner is
+      # pure-Python read-only; safe to call ahead of every install.
+      - name: Lockfile supply-chain audit (pre-install scan)
+        working-directory: ${{ github.workspace }}
+        run: python3 scripts/lockfile_supply_chain_audit.py
+
+      # Dependency bumps strand the version-pinned allowScripts entries.
+      # The paired pre-commit hook auto-fixes PRs; this is the backstop.
+      - name: allowScripts pins must match the lockfile
+        working-directory: ${{ github.workspace }}
+        run: |
+          python3 tests/studio/test_sync_allow_scripts_pins.py
+          python3 scripts/sync_allow_scripts_pins.py --check
+
+      - name: Lockfile must agree with package.json (npm ci is strict)
+        # The vite 8 chain (rolldown, lightningcss, tailwind oxide) ships napi
+        # binaries with no install scripts. The only script-bearing deps are
+        # covered by `allowScripts` in package.json (npm >=11.16, default in
+        # npm 12). The pre-install lockfile audit above stays the first line
+        # of defence -- it fires before any tarball can run code.
+        # --strict-allow-scripts: any unreviewed install script hard-fails
+        # the job; the sync hook keeps the pins fresh after bumps.
+        run: npm ci --strict-allow-scripts --no-fund --no-audit
+
+      - name: npm ci must not have modified the working tree
+        working-directory: ${{ github.workspace }}
+        run: |
+          if ! git diff --quiet -- studio/frontend; then
+            echo "::error::npm ci modified files; commit the updated lockfile"
+            git status -- studio/frontend
+            exit 1
+          fi
+
+      # Catch the common foot-gun: a dep dropped from package.json that is
+      # still imported somewhere. The script walks the lockfile dep graph
+      # from the new top-level deps and only counts top-level node_modules
+      # paths as valid resolution targets for bare src/ imports.
+      #
+      # actions/checkout uses fetch-depth: 1 by default, so the base branch
+      # is not available locally. Fetch the single base commit with an
+      # explicit refspec so origin/<base> is reliably created (a bare
+      # `git fetch origin <ref>` only updates FETCH_HEAD in some configs).
+      - name: Dependency removal safety check
+        if: github.event_name == 'pull_request'
+        working-directory: ${{ github.workspace }}
+        run: |
+          git fetch --no-tags --depth=1 origin \
+            "${{ github.base_ref }}:refs/remotes/origin/${{ github.base_ref }}"
+          python3 scripts/check_frontend_dep_removal.py \
+            --base "origin/${{ github.base_ref }}" \
+            --enumerate-dead
+          python3 tests/studio/test_frontend_dep_removal.py
+
+      - name: Typecheck
+        run: npm run typecheck
+
+      - name: Build
+        run: npm run build
+
+      - name: Built bundle must not contain Studio's unstable_Provider call site
+        run: |
+          set -e
+          JS=$(ls dist/assets/index-*.js | head -1)
+          HITS=$(grep -c 'unstable_Provider:' "$JS" || echo 0)
+          echo "main bundle: $JS"
+          echo "unstable_Provider: hits=$HITS (assistant-ui internals contribute up to 3)"
+          if [ "$HITS" -gt 3 ]; then
+            echo "::error file=studio/frontend/src/features/chat/runtime-provider.tsx::Studio bundle still passes unstable_Provider through useRemoteThreadListRuntime; this is the 2026.5.1 chat-history regression. Pass adapters directly into useLocalRuntime instead."
+            exit 1
+          fi
+
+      - name: Bundle size budget (75 MB)
+        run: |
+          SIZE=$(du -sb dist | cut -f1)
+          BUDGET=$((75 * 1024 * 1024))
+          echo "dist size: $SIZE bytes ($((SIZE/1024/1024)) MB), budget: $BUDGET bytes (75 MB)"
+          if [ "$SIZE" -gt "$BUDGET" ]; then
+            echo "::error::studio/frontend/dist/ exceeded the 75 MB budget. Drop dead deps (e.g. the unused next dep) or split chunks."
+            exit 1
+          fi
+
+      - name: Biome (non-blocking until accumulated drift is cleared)
+        continue-on-error: true
+        run: npm run biome:check
+
+      - name: Upload built dist
+        # Always upload so a green run is reviewable too -- the dist
+        # output catches "tests passed but bundle changed unexpectedly"
+        # regressions that would be invisible if we only kept artifacts
+        # on failure.
+        if: always()
+        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
+        with:
+          name: studio-frontend-dist
+          path: studio/frontend/dist
+          retention-days: 3
@@ -0,0 +1,68 @@
+# SPDX-License-Identifier: AGPL-3.0-only
+# Copyright 2026-present the Unsloth AI Inc. team. All rights reserved.
+#
+# Event-loop regression test for the Studio model-load orchestrator.
+# Pins down issue #5642 (Win10 UI freeze on model load): the /load
+# route calls LlamaCppBackend.detect_audio_type synchronously, blocking
+# the FastAPI event loop on a chain of sync httpx.Client.post() probes.
+#
+# The suite stands up a stdlib fake llama-server + a tiny FastAPI app
+# via uvicorn and asserts that detect_audio_type runs via
+# asyncio.to_thread so concurrent /api/inference/load-progress polling
+# stays responsive. CPU-only, no torch, no real llama.cpp binary, no
+# GPU -- the matching cross-OS staging proof lives on
+# danielhanchen/unsloth-staging-2 (Ubuntu / macOS / Windows all
+# green at PR time).
+
+name: Studio load-orchestrator CI
+
+on:
+  pull_request:
+    paths:
+      - 'studio/backend/routes/inference.py'
+      - 'studio/backend/core/inference/llama_cpp.py'
+      - 'tests/studio/load_freeze/**'
+      - '.github/workflows/studio-load-orchestrator-ci.yml'
+  push:
+    branches: [main]
+    paths:
+      - 'studio/backend/routes/inference.py'
+      - 'studio/backend/core/inference/llama_cpp.py'
+      - 'tests/studio/load_freeze/**'
+      - '.github/workflows/studio-load-orchestrator-ci.yml'
+  workflow_dispatch:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
+      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
+        with:
+          python-version: '3.12'
+          cache: 'pip'
+      - name: Install minimal deps (no torch, no unsloth)
+        # The test stubs `loggers` and `structlog`, imports
+        # core.inference.llama_cpp directly, and drives a small
+        # FastAPI app. Nothing here pulls torch or any GPU code,
+        # so the entire job typically completes in well under 60 s.
+        run: |
+          python -m pip install --upgrade pip
+          python -m pip install \
+            'pytest>=8' \
+            'httpx>=0.27,<1' \
+            'fastapi>=0.110,<1' \
+            'uvicorn>=0.30,<1' \
+            'anyio>=4'
+      - name: Run load-orchestrator tests
+        run: python -m pytest -v --tb=short tests/studio/load_freeze/
@@ -0,0 +1,152 @@
+# SPDX-License-Identifier: AGPL-3.0-only
+# Copyright 2026-present the Unsloth AI Inc. team. All rights reserved.
+
+# Mac counterpart to studio-api-smoke.yml. Same tests/studio/
+# studio_api_smoke.py exercise (CORS hardening, auth state machine,
+# JWT expiry, API key lifecycle, /v1/models / /v1/embeddings /
+# /v1/responses, endpoint-by-endpoint auth audit) but on a real
+# Apple Silicon (macos-14, M1) runner. Drops the apt-get block;
+# GitHub-hosted macos-14 ships curl + jq.
+
+name: Mac Studio API CI
+
+on:
+  pull_request:
+    paths:
+      - 'studio/**'
+      - 'unsloth/**'
+      - 'unsloth_cli/**'
+      - 'install.sh'
+      - 'pyproject.toml'
+      - 'tests/studio/**'
+      - '.github/workflows/studio-mac-api-smoke.yml'
+  push:
+    branches: [main, pip]
+  workflow_dispatch:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+jobs:
+  api-smoke:
+    name: Studio API & Auth Tests
+    runs-on: macos-14
+    timeout-minutes: 25
+    env:
+      GGUF_REPO: unsloth/gemma-3-270m-it-GGUF
+      GGUF_VARIANT: UD-Q4_K_XL
+      GGUF_FILE: gemma-3-270m-it-UD-Q4_K_XL.gguf
+      STUDIO_PORT: '18895'
+      HF_HOME: ${{ github.workspace }}/hf-cache
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
+
+      - uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e  # v6.4.0
+        with:
+          node-version: '22'
+
+      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
+        with:
+          python-version: '3.12'
+          cache: 'pip'
+
+      - name: Restore HF_HOME for ${{ env.GGUF_REPO }}
+        id: cache-hf
+        uses: actions/cache/restore@27d5ce7f107fe9357f9df03efb73ab90386fccae  # v5.0.5
+        continue-on-error: true
+        with:
+          path: hf-cache
+          key: ${{ runner.os }}-hf-${{ env.GGUF_REPO }}-${{ env.GGUF_VARIANT }}-v2
+
+      - name: Prime HF_HOME with the GGUF
+        id: prime-hf
+        if: steps.cache-hf.outputs.cache-hit != 'true' || steps.cache-hf.outcome != 'success'
+        env:
+          # Withheld on PR: this step runs checked-out PR code; public GGUF still downloads.
+          HF_TOKEN: ${{ github.event_name != 'pull_request' && secrets.HF_TOKEN || '' }}
+        run: |
+          python -m pip install --upgrade huggingface_hub
+          mkdir -p hf-cache
+          bash .github/scripts/hf-download-with-retry.sh "$GGUF_REPO" "$GGUF_FILE"
+          bash .github/scripts/hf-download-with-retry.sh ggml-org/models tinyllamas/stories260K.gguf
+
+      - name: Save HF_HOME for ${{ env.GGUF_REPO }}
+        if: always() && steps.prime-hf.outcome == 'success'
+        uses: actions/cache/save@27d5ce7f107fe9357f9df03efb73ab90386fccae  # v5.0.5
+        with:
+          path: hf-cache
+          key: ${{ runner.os }}-hf-${{ env.GGUF_REPO }}-${{ env.GGUF_VARIANT }}-v2
+
+      - name: Install Studio (--local, --no-torch)
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          # Withheld on PR: this step runs checked-out PR code; public GGUF still downloads.
+          HF_TOKEN: ${{ github.event_name != 'pull_request' && secrets.HF_TOKEN || '' }}
+        run: |
+          mkdir -p logs
+          set -o pipefail
+          bash install.sh --local --no-torch 2>&1 | tee logs/install.log
+
+      - name: Assert llama.cpp loads on this macOS
+        run: bash .github/scripts/assert-llama-loads.sh
+
+      - name: Install pyjwt for the JWT-expiry forge test
+        run: pip install 'pyjwt>=2.6'
+
+      - name: Reset auth + boot Studio (API-only)
+        run: |
+          unsloth studio reset-password
+          mkdir -p logs
+          UNSLOTH_API_ONLY=1 unsloth studio -H 127.0.0.1 -p "$STUDIO_PORT" \
+            > logs/studio.log 2>&1 &
+          echo "STUDIO_PID=$!" >> "$GITHUB_ENV"
+
+      - name: Wait for /api/health
+        run: |
+          for i in $(seq 1 180); do
+            if curl -fs "http://127.0.0.1:${STUDIO_PORT}/api/health" > /tmp/health.json; then
+              jq -e '.status == "healthy"' /tmp/health.json && break
+            fi
+            sleep 1
+          done
+          jq -e '.status == "healthy"' /tmp/health.json
+
+      - name: Pass bootstrap password + rotated targets to the test
+        run: |
+          OLD=$(cat ~/.unsloth/studio/auth/.bootstrap_password)
+          NEW="ApiSmoke-$(python -c 'import secrets; print(secrets.token_urlsafe(16))')"
+          NEW2="ApiSmoke-$(python -c 'import secrets; print(secrets.token_urlsafe(16))')"
+          echo "::add-mask::$OLD"
+          echo "::add-mask::$NEW"
+          echo "::add-mask::$NEW2"
+          echo "STUDIO_OLD_PW=$OLD"  >> "$GITHUB_ENV"
+          echo "STUDIO_NEW_PW=$NEW"  >> "$GITHUB_ENV"
+          echo "STUDIO_NEW2_PW=$NEW2" >> "$GITHUB_ENV"
+
+      - name: Run Studio API & Auth tests
+        env:
+          BASE_URL: http://127.0.0.1:18895
+          STUDIO_AUTH_DIR: /Users/runner/.unsloth/studio/auth
+        run: python tests/studio/studio_api_smoke.py
+
+      - name: Stop Studio
+        if: always()
+        run: |
+          kill "${STUDIO_PID}" 2>/dev/null || true
+          sleep 2
+
+      - name: Upload API smoke logs
+        if: always()
+        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
+        with:
+          name: mac-studio-api-smoke-log
+          path: |
+            logs/install.log
+            logs/studio.log
+          retention-days: 7
@@ -0,0 +1,82 @@
+# SPDX-License-Identifier: AGPL-3.0-only
+# Copyright 2026-present the Unsloth AI Inc. team. All rights reserved.
+
+# Proves Studio's llama.cpp install loads on every supported macOS. The heavy
+# app smokes stay single-OS; this matrix covers the OS-version dimension cheaply
+# (install.sh + binary-load assert). Regression guard for the macOS-version
+# selection in studio/install_llama_prebuilt.py.
+
+name: Mac Studio Install Matrix CI
+
+on:
+  pull_request:
+    paths:
+      - 'studio/install_llama_prebuilt.py'
+      - 'studio/setup.sh'
+      - 'install.sh'
+      - '.github/scripts/assert-llama-loads.sh'
+      - '.github/workflows/studio-mac-install-matrix.yml'
+  push:
+    branches: [main, pip]
+  workflow_dispatch:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+jobs:
+  install-load:
+    name: Install + load (${{ matrix.os }})
+    runs-on: ${{ matrix.os }}
+    timeout-minutes: 25
+    continue-on-error: ${{ matrix.experimental }}
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - os: macos-14        # Apple Silicon, macOS 14 Sonoma
+            experimental: false
+          - os: macos-15        # Apple Silicon, macOS 15 Sequoia
+            experimental: false
+          - os: macos-26        # Apple Silicon, macOS 26 Tahoe
+            experimental: false
+          - os: macos-15-intel  # Intel x86_64, macOS 15 (informational)
+            experimental: true
+          - os: macos-26-intel  # Intel x86_64, macOS 26 (last Intel macOS)
+            experimental: true
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
+
+      - uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e  # v6.4.0
+        with:
+          node-version: '22'
+
+      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
+        with:
+          python-version: '3.12'
+
+      - name: Install Studio (--local, --no-torch)
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          # Withheld on PR: this step runs checked-out PR code; public GGUF still downloads.
+          HF_TOKEN: ${{ github.event_name != 'pull_request' && secrets.HF_TOKEN || '' }}
+        run: |
+          mkdir -p logs
+          set -o pipefail
+          bash install.sh --local --no-torch 2>&1 | tee logs/install.log
+
+      - name: Assert llama.cpp loads on this macOS
+        run: bash .github/scripts/assert-llama-loads.sh
+
+      - name: Upload install log
+        if: always()
+        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
+        with:
+          name: mac-install-matrix-${{ matrix.os }}-log
+          path: logs/install.log
+          retention-days: 7
@@ -0,0 +1,347 @@
+# SPDX-License-Identifier: AGPL-3.0-only
+# Copyright 2026-present the Unsloth AI Inc. team. All rights reserved.
+
+# Mac counterpart to studio-ui-smoke.yml. Same Playwright + Chromium
+# end-to-end chat UI flow, but on macos-14 (M1) so we catch
+# Mac-specific frontend / backend wiring regressions that the Linux
+# job would miss (e.g. the Mac Tauri shell loading the same React
+# bundle, or the Mac llama.cpp prebuilt's HTTP layer behaving
+# differently from the Linux build).
+
+name: Mac Studio UI CI
+
+on:
+  pull_request:
+    paths:
+      - 'studio/**'
+      - 'unsloth/**'
+      - 'unsloth_cli/**'
+      - 'install.sh'
+      - 'pyproject.toml'
+      - 'tests/studio/**'
+      - '.github/workflows/studio-mac-ui-smoke.yml'
+  push:
+    branches: [main, pip]
+  workflow_dispatch:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+jobs:
+  ui-smoke:
+    name: Chat UI Tests
+    runs-on: macos-14
+    timeout-minutes: 35
+    env:
+      GGUF_REPO: unsloth/gemma-3-270m-it-GGUF
+      GGUF_VARIANT: UD-Q4_K_XL
+      GGUF_FILE: gemma-3-270m-it-UD-Q4_K_XL.gguf
+      STUDIO_PORT: '18896'
+      HF_HOME: ${{ github.workspace }}/hf-cache
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
+
+      - uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e  # v6.4.0
+        with:
+          node-version: '22'
+
+      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
+        with:
+          python-version: '3.12'
+          cache: 'pip'
+
+      - name: Restore HF_HOME for ${{ env.GGUF_REPO }}
+        id: cache-hf
+        uses: actions/cache/restore@27d5ce7f107fe9357f9df03efb73ab90386fccae  # v5.0.5
+        continue-on-error: true
+        with:
+          path: hf-cache
+          key: ${{ runner.os }}-hf-${{ env.GGUF_REPO }}-${{ env.GGUF_VARIANT }}-v2
+
+      - name: Prime HF_HOME with the GGUF
+        id: prime-hf
+        if: steps.cache-hf.outputs.cache-hit != 'true' || steps.cache-hf.outcome != 'success'
+        env:
+          # Withheld on PR: this step runs checked-out PR code; public GGUF still downloads.
+          HF_TOKEN: ${{ github.event_name != 'pull_request' && secrets.HF_TOKEN || '' }}
+        run: |
+          python -m pip install --upgrade huggingface_hub
+          mkdir -p hf-cache
+          bash .github/scripts/hf-download-with-retry.sh "$GGUF_REPO" "$GGUF_FILE"
+          bash .github/scripts/hf-download-with-retry.sh ggml-org/models tinyllamas/stories260K.gguf
+
+      - name: Save HF_HOME for ${{ env.GGUF_REPO }}
+        if: always() && steps.prime-hf.outcome == 'success'
+        uses: actions/cache/save@27d5ce7f107fe9357f9df03efb73ab90386fccae  # v5.0.5
+        with:
+          path: hf-cache
+          key: ${{ runner.os }}-hf-${{ env.GGUF_REPO }}-${{ env.GGUF_VARIANT }}-v2
+
+      - name: Install Studio (--local, --no-torch)
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          # Withheld on PR: this step runs checked-out PR code; public GGUF still downloads.
+          HF_TOKEN: ${{ github.event_name != 'pull_request' && secrets.HF_TOKEN || '' }}
+        run: |
+          mkdir -p logs
+          set -o pipefail
+          bash install.sh --local --no-torch 2>&1 | tee logs/install.log
+
+      - name: Assert llama.cpp loads on this macOS
+        run: bash .github/scripts/assert-llama-loads.sh
+
+      - name: Install Playwright + Chromium
+        # No --with-deps on Mac: that flag installs Linux apt packages.
+        # GitHub-hosted macos-14 ships the system frameworks Chromium
+        # needs already.
+        # Pinned <1.58 because all 1.55-1.58 drivers ship Node 24 on
+        # macos-14 and intermittently hit 'SyntaxError: Unexpected end
+        # of JSON input' in pipeTransport.js. Run 25491698868 showed
+        # the crash hitting 100% of three retry attempts -- not a
+        # rare race but a hard reproduction. Belt-and-suspenders fix:
+        # the test scripts pass --single-process to Chromium (see
+        # tests/studio/playwright_chat_ui.py) AND we patch
+        # pipeTransport.js below to swallow JSON parse errors instead
+        # of crashing the driver Node process. Both together let the
+        # in-script retry recover from any residual flakes.
+        run: |
+          pip install 'playwright>=1.55,<1.58'
+          python -m playwright install chromium
+
+      - name: Patch Playwright pipeTransport.js to tolerate malformed JSON
+        # In Playwright 1.55-1.58, pipeTransport.js does
+        # `JSON.parse(message)` with no try/catch; when Chromium dies
+        # mid-write the partial buffer crashes the driver Node
+        # process and the test script exits with 'Connection closed
+        # while reading from the driver'. Newer Playwright versions
+        # added a try/catch upstream. Backport that here.
+        run: |
+          python - <<'PY'
+          import os, re, sys
+          import playwright
+          driver_dir = os.path.join(os.path.dirname(playwright.__file__), "driver", "package", "lib", "server")
+          path = os.path.join(driver_dir, "pipeTransport.js")
+          src = open(path).read()
+          # Wrap both `this.onmessage.call(null, JSON.parse(...))` sites in try/catch.
+          patched = re.sub(
+              r"this\.onmessage\.call\(null, JSON\.parse\((message2?)\)\);",
+              r"try { this.onmessage.call(null, JSON.parse(\1)); } "
+              r"catch (e) { /* swallow malformed JSON from a crashing browser */ }",
+              src,
+          )
+          if patched == src:
+              # Already patched, or upstream changed -- either way, don't fail the build.
+              print(f"pipeTransport.js: no JSON.parse calls matched at {path}; skipping.")
+          else:
+              open(path, "w").write(patched)
+              print(f"pipeTransport.js: patched JSON.parse calls in {path}")
+          PY
+
+      - name: Reset auth + boot Studio
+        run: |
+          unsloth studio reset-password
+          mkdir -p logs
+          UNSLOTH_API_ONLY=1 unsloth studio -H 127.0.0.1 -p "$STUDIO_PORT" \
+            > logs/studio.log 2>&1 &
+          echo "STUDIO_PID=$!" >> "$GITHUB_ENV"
+
+      - name: Wait for /api/health
+        run: |
+          for i in $(seq 1 180); do
+            if curl -fs "http://127.0.0.1:${STUDIO_PORT}/api/health" > /tmp/health.json; then
+              jq -e '.status == "healthy"' /tmp/health.json && break
+            fi
+            sleep 1
+          done
+          jq -e '.status == "healthy"' /tmp/health.json
+
+      - name: Pass bootstrap password to the Playwright step
+        run: |
+          OLD=$(cat ~/.unsloth/studio/auth/.bootstrap_password)
+          NEW="CIUi-$(python -c 'import secrets; print(secrets.token_urlsafe(16))')"
+          NEW2="CIUi-$(python -c 'import secrets; print(secrets.token_urlsafe(16))')"
+          echo "::add-mask::$OLD"
+          echo "::add-mask::$NEW"
+          echo "::add-mask::$NEW2"
+          echo "STUDIO_OLD_PW=$OLD"   >> "$GITHUB_ENV"
+          echo "STUDIO_NEW_PW=$NEW"   >> "$GITHUB_ENV"
+          echo "STUDIO_NEW2_PW=$NEW2" >> "$GITHUB_ENV"
+
+      - name: Drive the chat UI with Playwright
+        env:
+          BASE_URL: http://127.0.0.1:18896
+          PW_ART_DIR: logs/playwright
+          STUDIO_UI_STRICT: '1'
+          # macos-14 free runner is 3 vCPU / 7 GB / no Metal-accel
+          # available to llama.cpp from CI; gemma-3-270m turn latency
+          # has been observed to crowd the 180s default. Triple it.
+          STUDIO_UI_TURN_TIMEOUT_MS: '540000'
+        # Retry up to 3 times to absorb known macos-14 free-runner
+        # flakes: (1) Playwright Node 24 pipeTransport.js 'Unexpected
+        # end of JSON input' crash when the Chromium browser process
+        # dies mid-test, (2) Chromium net::ERR_NO_BUFFER_SPACE when the
+        # runner's kernel briefly runs out of socket buffers, and (3) a
+        # goto 'interrupted by another navigation' when the SPA auth
+        # guard redirects mid-navigation. The retry FULLY resets Studio
+        # (kill, reset-password, reboot, wait /api/health, re-export
+        # bootstrap pw) before re-running the script. A real test failure
+        # (assertion / timeout) does NOT match any pattern so it bypasses
+        # retry and surfaces immediately.
+        run: |
+          mkdir -p logs/playwright
+          attempt=1
+          max_attempts=3
+          while : ; do
+            set +e
+            python tests/studio/playwright_chat_ui.py 2>&1 | tee logs/playwright_attempt_${attempt}.log
+            rc=${PIPESTATUS[0]}
+            set -e
+            if [ "$rc" -eq 0 ]; then
+              break
+            fi
+            if { grep -q "Unexpected end of JSON input"       logs/playwright_attempt_${attempt}.log \
+                 || grep -q "ERR_NO_BUFFER_SPACE"             logs/playwright_attempt_${attempt}.log \
+                 || grep -q "interrupted by another navigation" logs/playwright_attempt_${attempt}.log; } \
+               && [ "$attempt" -lt "$max_attempts" ]; then
+              echo "::warning::Playwright flake on attempt ${attempt}; resetting Studio and retrying..."
+              kill "${STUDIO_PID}" 2>/dev/null || true
+              sleep 2
+              unsloth studio reset-password
+              UNSLOTH_API_ONLY=1 unsloth studio -H 127.0.0.1 -p "$STUDIO_PORT" \
+                > "logs/studio_retry_${attempt}.log" 2>&1 &
+              STUDIO_PID=$!
+              echo "STUDIO_PID=$STUDIO_PID" >> "$GITHUB_ENV"
+              for i in $(seq 1 180); do
+                if curl -fs "http://127.0.0.1:${STUDIO_PORT}/api/health" > /tmp/health.json \
+                   && jq -e '.status == "healthy"' /tmp/health.json >/dev/null; then
+                  break
+                fi
+                sleep 1
+              done
+              STUDIO_OLD_PW=$(cat ~/.unsloth/studio/auth/.bootstrap_password)
+              STUDIO_NEW_PW="CIUi-$(python -c 'import secrets; print(secrets.token_urlsafe(16))')"
+              STUDIO_NEW2_PW="CIUi-$(python -c 'import secrets; print(secrets.token_urlsafe(16))')"
+              echo "::add-mask::$STUDIO_OLD_PW"
+              echo "::add-mask::$STUDIO_NEW_PW"
+              echo "::add-mask::$STUDIO_NEW2_PW"
+              export STUDIO_OLD_PW STUDIO_NEW_PW STUDIO_NEW2_PW
+              attempt=$((attempt + 1))
+              sleep 3
+              continue
+            fi
+            exit "$rc"
+          done
+
+      - name: Stop Studio (chat-ui ends with Shutdown click; this is belt-and-suspenders)
+        if: always()
+        run: |
+          kill "${STUDIO_PID}" 2>/dev/null || true
+          sleep 2
+
+      - name: Reset auth + boot Studio for extra UI tests (port 18897)
+        run: |
+          unsloth studio reset-password
+          mkdir -p logs
+          UNSLOTH_API_ONLY=1 unsloth studio -H 127.0.0.1 -p 18897 \
+            > logs/studio_extra.log 2>&1 &
+          echo "STUDIO_EXTRA_PID=$!" >> "$GITHUB_ENV"
+
+      - name: Wait for /api/health on 18897
+        run: |
+          for i in $(seq 1 180); do
+            if curl -fs "http://127.0.0.1:18897/api/health" > /tmp/health2.json; then
+              jq -e '.status == "healthy"' /tmp/health2.json && break
+            fi
+            sleep 1
+          done
+          jq -e '.status == "healthy"' /tmp/health2.json
+
+      - name: Pass bootstrap pw for extra UI test
+        run: |
+          OLD=$(cat ~/.unsloth/studio/auth/.bootstrap_password)
+          NEW="CIUiExtra-$(python -c 'import secrets; print(secrets.token_urlsafe(16))')"
+          echo "::add-mask::$OLD"
+          echo "::add-mask::$NEW"
+          echo "STUDIO_EXTRA_OLD_PW=$OLD" >> "$GITHUB_ENV"
+          echo "STUDIO_EXTRA_NEW_PW=$NEW" >> "$GITHUB_ENV"
+
+      - name: Drive Compare/Recipes/Export/Studio/Settings with Playwright
+        env:
+          BASE_URL: http://127.0.0.1:18897
+          STUDIO_OLD_PW: ${{ env.STUDIO_EXTRA_OLD_PW }}
+          STUDIO_NEW_PW: ${{ env.STUDIO_EXTRA_NEW_PW }}
+          PW_ART_DIR: logs/playwright_extra
+          STUDIO_UI_STRICT: '1'
+          # See "Drive the chat UI" step.
+          STUDIO_UI_TURN_TIMEOUT_MS: '540000'
+          GGUF_REPO: ${{ env.GGUF_REPO }}
+          GGUF_VARIANT: ${{ env.GGUF_VARIANT }}
+        # Same flake-retry shape as "Drive the chat UI with Playwright" -- catches
+        # pipeTransport JSON crash, ERR_NO_BUFFER_SPACE, and nav interrupts.
+        run: |
+          mkdir -p logs/playwright_extra
+          attempt=1
+          max_attempts=3
+          while : ; do
+            set +e
+            python tests/studio/playwright_extra_ui.py 2>&1 | tee logs/playwright_extra_attempt_${attempt}.log
+            rc=${PIPESTATUS[0]}
+            set -e
+            if [ "$rc" -eq 0 ]; then
+              break
+            fi
+            if { grep -q "Unexpected end of JSON input"       logs/playwright_extra_attempt_${attempt}.log \
+                 || grep -q "ERR_NO_BUFFER_SPACE"             logs/playwright_extra_attempt_${attempt}.log \
+                 || grep -q "interrupted by another navigation" logs/playwright_extra_attempt_${attempt}.log; } \
+               && [ "$attempt" -lt "$max_attempts" ]; then
+              echo "::warning::Playwright flake on attempt ${attempt}; resetting Studio and retrying..."
+              kill "${STUDIO_EXTRA_PID}" 2>/dev/null || true
+              sleep 2
+              unsloth studio reset-password
+              UNSLOTH_API_ONLY=1 unsloth studio -H 127.0.0.1 -p 18897 \
+                > "logs/studio_extra_retry_${attempt}.log" 2>&1 &
+              STUDIO_EXTRA_PID=$!
+              echo "STUDIO_EXTRA_PID=$STUDIO_EXTRA_PID" >> "$GITHUB_ENV"
+              for i in $(seq 1 180); do
+                if curl -fs "http://127.0.0.1:18897/api/health" > /tmp/health2.json \
+                   && jq -e '.status == "healthy"' /tmp/health2.json >/dev/null; then
+                  break
+                fi
+                sleep 1
+              done
+              STUDIO_OLD_PW=$(cat ~/.unsloth/studio/auth/.bootstrap_password)
+              STUDIO_NEW_PW="CIUiExtra-$(python -c 'import secrets; print(secrets.token_urlsafe(16))')"
+              echo "::add-mask::$STUDIO_OLD_PW"
+              echo "::add-mask::$STUDIO_NEW_PW"
+              export STUDIO_OLD_PW STUDIO_NEW_PW
+              attempt=$((attempt + 1))
+              sleep 3
+              continue
+            fi
+            exit "$rc"
+          done
+
+      - name: Stop second Studio
+        if: always()
+        run: |
+          kill "${STUDIO_EXTRA_PID}" 2>/dev/null || true
+          sleep 2
+
+      - name: Upload Playwright artifacts
+        if: always()
+        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
+        with:
+          name: mac-studio-ui-smoke-artifacts
+          path: |
+            logs/studio.log
+            logs/studio_extra.log
+            logs/install.log
+            logs/playwright
+            logs/playwright_extra
+          retention-days: 7
@@ -0,0 +1,177 @@
+# SPDX-License-Identifier: AGPL-3.0-only
+# Copyright 2026-present the Unsloth AI Inc. team. All rights reserved.
+
+# Mac counterpart to studio-update-smoke.yml. Verifies that on a real
+# Apple Silicon (macos-14, M1) runner:
+#
+#   1. install.sh --local --no-torch installs Studio AND auto-fetches
+#      the prebuilt llama.cpp Mac binary (llama-bNNNN-bin-macos-arm64
+#      from ggml-org/llama.cpp). Hitting the source-build fallback is
+#      treated as an Unsloth bug -- Studio must always pick the
+#      prebuilt on Mac.
+#   2. unsloth studio update --local is idempotent. Two consecutive
+#      runs both report "prebuilt up to date and validated", no
+#      source-build fallback.
+#   3. The installed Studio still boots and /api/health returns
+#      healthy after the update path.
+
+name: Mac Studio Update CI
+
+on:
+  pull_request:
+    paths:
+      - 'install.sh'
+      - 'scripts/uninstall.sh'
+      - 'studio/setup.sh'
+      - 'studio/install_python_stack.py'
+      - 'studio/install_llama_prebuilt.py'
+      - 'studio/backend/requirements/**'
+      - 'unsloth_cli/commands/studio.py'
+      - 'pyproject.toml'
+      - '.github/workflows/studio-mac-update-smoke.yml'
+  push:
+    branches: [main, pip]
+  workflow_dispatch:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+jobs:
+  update-idempotency:
+    name: Studio Updating Tests
+    runs-on: macos-14
+    timeout-minutes: 30
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
+
+      - uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e  # v6.4.0
+        with:
+          node-version: '22'
+
+      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
+        with:
+          python-version: '3.12'
+          cache: 'pip'
+
+      - name: Install Studio (--local, --no-torch)
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          # Withheld on PR: this step runs checked-out PR code; public GGUF still downloads.
+          HF_TOKEN: ${{ github.event_name != 'pull_request' && secrets.HF_TOKEN || '' }}
+        run: |
+          mkdir -p logs
+          set -o pipefail
+          bash install.sh --local --no-torch 2>&1 | tee logs/install.log
+
+      - name: Assert llama.cpp loads on this macOS
+        run: bash .github/scripts/assert-llama-loads.sh
+
+      - name: First update should be a no-op (prebuilt already validated)
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          # Withheld on PR: this step runs checked-out PR code; public GGUF still downloads.
+          HF_TOKEN: ${{ github.event_name != 'pull_request' && secrets.HF_TOKEN || '' }}
+        run: |
+          set -o pipefail
+          unsloth studio update --local 2>&1 | tee logs/update.log
+          if grep -q "falling back to source build" logs/update.log; then
+            echo "::error::studio update fell back to source-build llama.cpp on Mac."
+            grep -E "llama-prebuilt|llama.cpp" logs/update.log | tail -60
+            exit 1
+          fi
+          if ! grep -qE "prebuilt up to date and validated|prebuilt installed and validated" logs/update.log; then
+            echo "::error::no prebuilt up-to-date marker in update.log."
+            grep -E "llama-prebuilt|llama.cpp" logs/update.log | tail -60
+            exit 1
+          fi
+          echo "update path took the prebuilt fast path"
+
+      - name: Second update must also be a no-op
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          # Withheld on PR: this step runs checked-out PR code; public GGUF still downloads.
+          HF_TOKEN: ${{ github.event_name != 'pull_request' && secrets.HF_TOKEN || '' }}
+        run: |
+          set -o pipefail
+          unsloth studio update --local 2>&1 | tee logs/update2.log
+          grep -q "falling back to source build" logs/update2.log && {
+              echo "::error::second update fell back to source build on Mac"
+              tail -60 logs/update2.log; exit 1; } || true
+          grep -qE "prebuilt up to date and validated|prebuilt installed and validated" logs/update2.log
+          echo "second update was clean"
+
+      - name: Boot Studio briefly to confirm the install is still usable
+        run: |
+          mkdir -p logs
+          UNSLOTH_API_ONLY=1 unsloth studio -H 127.0.0.1 -p 18891 \
+            > logs/studio.log 2>&1 &
+          PID=$!
+          HEALTHY=""
+          for i in $(seq 1 60); do
+            if curl -fs http://127.0.0.1:18891/api/health > /tmp/health.json; then
+              if python3 -c "import json,sys; d=json.load(open('/tmp/health.json')); sys.exit(0 if d.get('status')=='healthy' else 1)"; then
+                HEALTHY=1
+                break
+              fi
+            fi
+            sleep 1
+          done
+          if [ -z "$HEALTHY" ]; then
+            echo "Studio failed to come up after \`update\`"
+            tail -200 logs/studio.log
+            kill "$PID" 2>/dev/null || true
+            exit 1
+          fi
+          kill "$PID" 2>/dev/null || true
+          echo "post-update Studio /api/health OK"
+
+      - name: Uninstall and verify clean
+        # Round-trip through scripts/uninstall.sh on real macOS. As a side
+        # effect this exercises the macOS-only .app bundle + Launch Services
+        # removal path (~/Applications/Unsloth Studio.app, lsregister -u)
+        # which is not testable from a Linux runner. Skips gracefully if
+        # scripts/uninstall.sh has not landed yet (lets this workflow merge
+        # before #5497).
+        run: |
+          set -o pipefail
+          if [ ! -f scripts/uninstall.sh ]; then
+            echo "scripts/uninstall.sh not present in this tree; skipping round-trip"
+            : > logs/uninstall.log
+            exit 0
+          fi
+          sh scripts/uninstall.sh 2>&1 | tee logs/uninstall.log
+          leak=0
+          for p in \
+            "$HOME/.unsloth/studio" \
+            "$HOME/.local/share/unsloth" \
+            "$HOME/Applications/Unsloth Studio.app" \
+            "$HOME/Desktop/Unsloth Studio.app" \
+            "$HOME/.local/bin/unsloth"; do
+            if [ -e "$p" ] || [ -L "$p" ]; then
+              echo "::error::leak: $p"
+              leak=$((leak + 1))
+            fi
+          done
+          [ "$leak" -eq 0 ] || exit 1
+          sh scripts/uninstall.sh 2>&1 | tail -5
+          sh scripts/uninstall.sh 2>&1 | tail -5
+          echo "PASS: mac install -> update -> uninstall round-trip clean"
+
+      - name: Upload update logs
+        if: always()
+        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
+        with:
+          name: mac-studio-update-log
+          path: |
+            logs/install.log
+            logs/update.log
+            logs/update2.log
+            logs/studio.log
+            logs/uninstall.log
+          retention-days: 7
@@ -0,0 +1,128 @@
+# SPDX-License-Identifier: AGPL-3.0-only
+# Copyright 2026-present the Unsloth AI Inc. team. All rights reserved.
+
+# PR-time smoke for the Tauri desktop wrapper. Builds the frontend and the
+# Tauri Linux debug binary, with no codesigning. Catches:
+#   - tauri.conf.json drift
+#   - src-tauri Cargo.toml or rust source breakage
+#   - Tauri CLI version drift (we pin 2.10.1, matching release-desktop.yml)
+#   - frontend output not picked up by Tauri's distDir
+#
+# Linux-only on a free `ubuntu-latest` runner. Mac and Windows desktop builds
+# stay in release-desktop.yml (manual `workflow_dispatch`) because they need
+# code-signing secrets and ~30 min of runner time each.
+
+name: Studio Tauri CI
+
+on:
+  pull_request:
+    paths:
+      - 'studio/frontend/**'
+      - 'studio/src-tauri/**'
+      # CLI rename / signature change can break Tauri's spawned
+      # `unsloth studio` -- include unsloth_cli in the trigger set.
+      - 'unsloth_cli/**'
+      - '.github/workflows/studio-tauri-smoke.yml'
+  push:
+    branches: [main, pip]
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+jobs:
+  linux-debug-build:
+    name: Tauri Linux debug build (no codesign)
+    runs-on: ubuntu-22.04
+    timeout-minutes: 25
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
+
+      - name: Linux native deps for Tauri / WebKit2GTK
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y \
+            libwebkit2gtk-4.1-dev libappindicator3-dev \
+            librsvg2-dev libxdo-dev libssl-dev patchelf
+
+      - uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e  # v6.4.0
+        with:
+          node-version: '24'
+
+      - uses: dtolnay/rust-toolchain@29eef336d9b2848a0b548edc03f92a220660cdb8  # stable @ 2026-03-27
+
+      - uses: swatinem/rust-cache@e18b497796c12c097a38f9edb9d0641fb99eee32  # v2.9.1
+        with:
+          workspaces: studio/src-tauri -> target
+
+      - name: Install pinned Tauri CLI (matches release-desktop.yml)
+        # Lifecycle scripts (esbuild native-binary postinstall, etc.) are
+        # required for `vite build`. The pre-install lockfile structural
+        # audit (lockfile_supply_chain_audit.py) is the practical defence
+        # against the npm postinstall-dropper class -- it fires BEFORE any
+        # tarball runs, on the injection pattern itself rather than an
+        # advisory-DB lookup.
+        run: npm install --save-dev --prefix studio @tauri-apps/cli@2.10.1 --no-fund --no-audit
+
+      - name: Verify pinned Tauri CLI version
+        run: |
+          out="$(npx --prefix studio tauri --version)"
+          echo "$out"
+          [ "$out" = "tauri-cli 2.10.1" ] || { echo "::error::expected tauri-cli 2.10.1, got $out"; exit 1; }
+
+      - name: Lockfile supply-chain audit (pre-install scan)
+        run: python3 scripts/lockfile_supply_chain_audit.py
+
+      - name: Frontend build (npm ci, vite)
+        working-directory: studio/frontend
+        # Lifecycle scripts (esbuild native-binary postinstall, etc.) are
+        # required for `vite build`. The pre-install lockfile structural
+        # audit (lockfile_supply_chain_audit.py) is the practical defence
+        # against the npm postinstall-dropper class -- it fires BEFORE any
+        # tarball runs, on the injection pattern itself rather than an
+        # advisory-DB lookup.
+        run: |
+          npm ci --no-fund --no-audit
+          npm run build
+          test -f dist/index.html
+
+      - name: Tauri debug build (Linux, no bundle, no codesign)
+        # `--debug` + `--no-bundle` keeps this lean: compiles the Rust crate,
+        # confirms the frontend dist is wired into Tauri, but skips the AppImage
+        # / .deb production. Code signing is irrelevant because we never produce
+        # a distributable artifact.
+        env:
+          TAURI_SIGNING_PRIVATE_KEY: ''
+          TAURI_SIGNING_PRIVATE_KEY_PASSWORD: ''
+        run: npx --prefix studio tauri build --debug --no-bundle
+
+      - name: Inspect produced binary
+        run: |
+          BIN=$(find studio/src-tauri/target/debug -maxdepth 1 -type f -executable 2>/dev/null \
+                | grep -Ev '\.(d|so|dylib|dll)$' \
+                | grep -Ev '/(deps|build|examples)$' \
+                | head -1)
+          echo "binary: $BIN"
+          if [ -z "$BIN" ]; then
+            echo "::error::Tauri debug binary not produced"
+            ls -la studio/src-tauri/target/debug/ || true
+            exit 1
+          fi
+          file "$BIN"
+          du -h "$BIN"
+
+      - name: Upload Tauri debug build
+        # Always upload so a green run leaves the binary inspectable too.
+        if: always()
+        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
+        with:
+          name: tauri-debug-build
+          path: |
+            studio/src-tauri/target/debug
+            studio/frontend/dist
+          retention-days: 3
@@ -0,0 +1,302 @@
+# SPDX-License-Identifier: AGPL-3.0-only
+# Copyright 2026-present the Unsloth AI Inc. team. All rights reserved.
+
+# End-to-end Studio chat UI smoke via Playwright + Chromium against a
+# headless Linux runner. Boots Studio with the smallest GGUF
+# (gemma-3-270m-it UD-Q4_K_XL, ~254 MiB), drives the actual frontend
+# bundle, and asserts the full bootstrap-password / change-password /
+# send-message / persist-on-reload journey works end to end.
+#
+# This is the only workflow that catches regressions in the wiring
+# between the React frontend and the FastAPI backend, e.g. assistant-ui
+# version drift, /api/auth response shape changes, runtime-provider
+# regressions, or chat-history persistence breaking. Backend-only and
+# frontend-only CI happily pass while the actual user-visible UI is
+# broken (cf. the 2026.5.1 chat-history release).
+
+name: Studio UI CI
+
+on:
+  pull_request:
+    paths:
+      - 'studio/**'
+      - 'unsloth/**'
+      - 'unsloth_cli/**'
+      - 'install.sh'
+      - 'pyproject.toml'
+      # The Playwright test files themselves -- a PR that ONLY edits
+      # the test must still trigger UI CI.
+      - 'tests/studio/**'
+      - '.github/workflows/studio-ui-smoke.yml'
+  push:
+    branches: [main, pip]
+  workflow_dispatch:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+jobs:
+  ui-smoke:
+    name: Chat UI Tests
+    runs-on: ubuntu-latest
+    timeout-minutes: 25
+    env:
+      GGUF_REPO: unsloth/gemma-3-270m-it-GGUF
+      GGUF_VARIANT: UD-Q4_K_XL
+      GGUF_FILE: gemma-3-270m-it-UD-Q4_K_XL.gguf
+      STUDIO_PORT: '18892'
+      HF_HOME: ${{ github.workspace }}/hf-cache
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
+
+      - name: Linux deps
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y --no-install-recommends \
+            libcurl4-openssl-dev libssl-dev jq
+
+      - uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e  # v6.4.0
+        with:
+          node-version: '22'
+
+      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
+        with:
+          python-version: '3.12'
+          cache: 'pip'
+
+      - name: Restore HF_HOME for ${{ env.GGUF_REPO }}
+        id: cache-hf
+        uses: actions/cache/restore@27d5ce7f107fe9357f9df03efb73ab90386fccae  # v5.0.5
+        continue-on-error: true
+        with:
+          path: hf-cache
+          key: ${{ runner.os }}-hf-${{ env.GGUF_REPO }}-${{ env.GGUF_VARIANT }}-v2
+
+      - name: Prime HF_HOME with the GGUF
+        id: prime-hf
+        if: steps.cache-hf.outputs.cache-hit != 'true' || steps.cache-hf.outcome != 'success'
+        env:
+          # Withheld on PR: this step runs checked-out PR code; public GGUF still downloads.
+          HF_TOKEN: ${{ github.event_name != 'pull_request' && secrets.HF_TOKEN || '' }}
+        run: |
+          python -m pip install --upgrade huggingface_hub
+          mkdir -p hf-cache
+          bash .github/scripts/hf-download-with-retry.sh "$GGUF_REPO" "$GGUF_FILE"
+          bash .github/scripts/hf-download-with-retry.sh ggml-org/models tinyllamas/stories260K.gguf
+
+      - name: Save HF_HOME for ${{ env.GGUF_REPO }}
+        if: always() && steps.prime-hf.outcome == 'success'
+        uses: actions/cache/save@27d5ce7f107fe9357f9df03efb73ab90386fccae  # v5.0.5
+        with:
+          path: hf-cache
+          key: ${{ runner.os }}-hf-${{ env.GGUF_REPO }}-${{ env.GGUF_VARIANT }}-v2
+
+      - name: Install Studio (--local, --no-torch)
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          # Withheld on PR: this step runs checked-out PR code; public GGUF still downloads.
+          HF_TOKEN: ${{ github.event_name != 'pull_request' && secrets.HF_TOKEN || '' }}
+        run: |
+          mkdir -p logs
+          set -o pipefail
+          bash install.sh --local --no-torch 2>&1 | tee logs/install.log
+
+      - name: Install Playwright + Chromium
+        run: |
+          pip install 'playwright>=1.45'
+          # --with-deps installs the OS-level runtime libs Chromium
+          # needs (libnss3, libxkbcommon, etc.). About 30 s on a
+          # warm runner.
+          python -m playwright install --with-deps chromium
+
+      - name: Reset auth + boot Studio
+        run: |
+          unsloth studio reset-password
+          mkdir -p logs
+          UNSLOTH_API_ONLY=1 unsloth studio -H 127.0.0.1 -p "$STUDIO_PORT" \
+            > logs/studio.log 2>&1 &
+          echo "STUDIO_PID=$!" >> "$GITHUB_ENV"
+
+      - name: Wait for /api/health
+        # 180 s -- a cold runner with venv warm-up + lazy imports has
+        # been seen to exceed 60 s. Failing the wait is more expensive
+        # than waiting an extra two minutes.
+        run: |
+          for i in $(seq 1 180); do
+            if curl -fs "http://127.0.0.1:${STUDIO_PORT}/api/health" > /tmp/health.json; then
+              jq -e '.status == "healthy"' /tmp/health.json && break
+            fi
+            sleep 1
+          done
+          jq -e '.status == "healthy"' /tmp/health.json
+
+      - name: Pass bootstrap password to the Playwright step
+        # The Playwright test does its OWN /change-password through the
+        # UI (Setup your account / Choose a new password), then loads
+        # the model via page.evaluate against /api/inference/load with
+        # the JWT it got from change-password. So the only thing we
+        # have to hand it is the bootstrap password (so it can verify
+        # post-rotation that the OLD bootstrap pw now returns 401).
+        #
+        # NEW + NEW2 are generated freshly per CI run via secrets.token_urlsafe
+        # rather than hardcoded. If a workflow gets compromised, the
+        # attacker can't replay a known-good rotated password against
+        # any future / parallel Studio install -- the rotated value
+        # only ever exists for the lifetime of this single job, masked
+        # in the log via ::add-mask::.
+        run: |
+          OLD=$(cat ~/.unsloth/studio/auth/.bootstrap_password)
+          NEW="CIUi-$(python -c 'import secrets; print(secrets.token_urlsafe(16))')"
+          NEW2="CIUi-$(python -c 'import secrets; print(secrets.token_urlsafe(16))')"
+          echo "::add-mask::$OLD"
+          echo "::add-mask::$NEW"
+          echo "::add-mask::$NEW2"
+          echo "STUDIO_OLD_PW=$OLD"   >> "$GITHUB_ENV"
+          echo "STUDIO_NEW_PW=$NEW"   >> "$GITHUB_ENV"
+          echo "STUDIO_NEW2_PW=$NEW2" >> "$GITHUB_ENV"
+
+      - name: Drive the chat UI with Playwright
+        env:
+          BASE_URL: http://127.0.0.1:18892
+          # The test file lives in the repo so it can be run locally
+          # against a freshly-installed Studio (BASE_URL=...; STUDIO_OLD_PW=
+          # $(cat ~/.unsloth/studio/auth/.bootstrap_password); python ...).
+          PW_ART_DIR: logs/playwright
+          # Strict mode: in CI a missing button / nav / dialog must
+          # FAIL the test. Locally the test still runs against partial
+          # Studio installs without STUDIO_UI_STRICT.
+          STUDIO_UI_STRICT: '1'
+        run: |
+          mkdir -p logs/playwright
+          python tests/studio/playwright_chat_ui.py
+
+      - name: Stop Studio (chat-ui ends with Shutdown click; this is belt-and-suspenders)
+        if: always()
+        run: |
+          kill "${STUDIO_PID}" 2>/dev/null || true
+          sleep 2
+
+      # The chat UI test ends by clicking the Shutdown menuitem, which
+      # leaves the server dead. The extra UI test (Compare / Recipes /
+      # Export / Studio / Settings) needs a fresh Studio, so we boot a
+      # second one on a different port. Boot is fast (~3-5s on the
+      # warm install we already did) so this adds little wall time.
+      - name: Reset auth + boot Studio for extra UI tests (port 18894)
+        run: |
+          unsloth studio reset-password
+          mkdir -p logs
+          UNSLOTH_API_ONLY=1 unsloth studio -H 127.0.0.1 -p 18894 \
+            > logs/studio_extra.log 2>&1 &
+          echo "STUDIO_EXTRA_PID=$!" >> "$GITHUB_ENV"
+
+      - name: Wait for /api/health on 18894
+        run: |
+          for i in $(seq 1 180); do
+            if curl -fs "http://127.0.0.1:18894/api/health" > /tmp/health2.json; then
+              jq -e '.status == "healthy"' /tmp/health2.json && break
+            fi
+            sleep 1
+          done
+          jq -e '.status == "healthy"' /tmp/health2.json
+
+      - name: Pass bootstrap pw for extra UI test
+        run: |
+          OLD=$(cat ~/.unsloth/studio/auth/.bootstrap_password)
+          NEW="CIUiExtra-$(python -c 'import secrets; print(secrets.token_urlsafe(16))')"
+          echo "::add-mask::$OLD"
+          echo "::add-mask::$NEW"
+          echo "STUDIO_EXTRA_OLD_PW=$OLD" >> "$GITHUB_ENV"
+          echo "STUDIO_EXTRA_NEW_PW=$NEW" >> "$GITHUB_ENV"
+
+      - name: Drive Compare/Recipes/Export/Studio/Settings with Playwright
+        env:
+          BASE_URL: http://127.0.0.1:18894
+          STUDIO_OLD_PW: ${{ env.STUDIO_EXTRA_OLD_PW }}
+          STUDIO_NEW_PW: ${{ env.STUDIO_EXTRA_NEW_PW }}
+          PW_ART_DIR: logs/playwright_extra
+          STUDIO_UI_STRICT: '1'
+          GGUF_REPO: ${{ env.GGUF_REPO }}
+          GGUF_VARIANT: ${{ env.GGUF_VARIANT }}
+        run: |
+          mkdir -p logs/playwright_extra
+          python tests/studio/playwright_extra_ui.py
+
+      - name: Stop second Studio
+        if: always()
+        run: |
+          kill "${STUDIO_EXTRA_PID}" 2>/dev/null || true
+          sleep 2
+
+      # IME + multilingual paste regression (issue #5318 / PR #5327).
+      # Third Studio on its own port so a hang here cannot poison the
+      # earlier UI tests. No GGUF -- the bug surface is the composer.
+      - name: Reset auth + boot Studio for IME / i18n tests (port 18896)
+        run: |
+          unsloth studio reset-password
+          mkdir -p logs
+          UNSLOTH_API_ONLY=1 unsloth studio -H 127.0.0.1 -p 18896 \
+            > logs/studio_ime.log 2>&1 &
+          echo "STUDIO_IME_PID=$!" >> "$GITHUB_ENV"
+
+      - name: Wait for /api/health on 18896
+        run: |
+          for i in $(seq 1 180); do
+            if curl -fs "http://127.0.0.1:18896/api/health" > /tmp/health3.json; then
+              jq -e '.status == "healthy"' /tmp/health3.json && break
+            fi
+            sleep 1
+          done
+          jq -e '.status == "healthy"' /tmp/health3.json
+
+      - name: Pass bootstrap pw for IME / i18n test
+        # IME smoke does the change-password against the bootstrap that
+        # Studio's frontend injects into the page, so it only needs the
+        # NEW password.
+        run: |
+          NEW="CIIme-$(python -c 'import secrets; print(secrets.token_urlsafe(16))')"
+          echo "::add-mask::$NEW"
+          echo "STUDIO_IME_NEW_PW=$NEW" >> "$GITHUB_ENV"
+
+      - name: Drive IME + multilingual paste regression with Playwright
+        env:
+          BASE_URL: http://127.0.0.1:18896
+          STUDIO_NEW_PW: ${{ env.STUDIO_IME_NEW_PW }}
+          PW_ART_DIR: logs/playwright_ime
+          STUDIO_UI_STRICT: '1'
+        run: |
+          mkdir -p logs/playwright_ime
+          python tests/studio/playwright_chat_ime_i18n.py
+
+      - name: Stop third Studio
+        if: always()
+        run: |
+          kill "${STUDIO_IME_PID}" 2>/dev/null || true
+          sleep 2
+          # Capture backend + llama-server logs (all three Studios share this
+          # dir) so a stray 500 has a server-side traceback.
+          mkdir -p logs/server-logs
+          cp -r ~/.unsloth/studio/logs/. logs/server-logs/ 2>/dev/null || true
+
+      - name: Upload Playwright artifacts
+        # Always upload so a green run's screenshots stay reviewable --
+        # catches "passed but the UI is silently broken" regressions.
+        if: always()
+        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
+        with:
+          name: studio-ui-smoke-artifacts
+          path: |
+            logs/studio.log
+            logs/studio_extra.log
+            logs/studio_ime.log
+            logs/install.log
+            logs/server-logs/
+            logs/playwright
+            logs/playwright_extra
+            logs/playwright_ime
+          retention-days: 7
@@ -0,0 +1,197 @@
+# SPDX-License-Identifier: AGPL-3.0-only
+# Copyright 2026-present the Unsloth AI Inc. team. All rights reserved.
+
+# Verifies that `unsloth studio update --local` is idempotent: a fresh
+# install via install.sh, followed by `unsloth studio update --local`,
+# succeeds and is a no-op for the llama.cpp prebuilt (it should report
+# "prebuilt up to date and validated", not re-run the source build).
+#
+# This catches regressions in setup.sh's update path that the existing
+# GGUF / wheel jobs would miss because they only invoke install.sh once.
+
+name: Studio Update CI
+
+on:
+  pull_request:
+    paths:
+      - 'install.sh'
+      - 'scripts/uninstall.sh'
+      - 'studio/setup.sh'
+      - 'studio/install_python_stack.py'
+      - 'studio/install_llama_prebuilt.py'
+      - 'studio/backend/requirements/**'
+      - 'unsloth_cli/commands/studio.py'
+      - 'pyproject.toml'
+      - '.github/workflows/studio-update-smoke.yml'
+  push:
+    branches: [main, pip]
+  workflow_dispatch:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+jobs:
+  update-idempotency:
+    name: Studio Updating Tests
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
+
+      - name: Linux deps for llama.cpp prebuilt
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y --no-install-recommends \
+            libcurl4-openssl-dev libssl-dev jq
+
+      - uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e  # v6.4.0
+        with:
+          node-version: '22'
+
+      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
+        with:
+          python-version: '3.12'
+          # Don't cache pip: this job runs `bash install.sh` and
+          # `unsloth studio update --local` which both go through
+          # `uv` and never populate ~/.cache/pip. setup-python's
+          # post-step then fatal-errors with "Cache folder path is
+          # retrieved for pip but doesn't exist on disk".
+
+      - name: Install Studio (--local, --no-torch)
+        # Pass the workflow token so the llama.cpp prebuilt installer's
+        # GitHub-API call to list releases isn't rate-limited (60/hr
+        # unauthenticated). Without this, three consecutive install +
+        # update + update calls in this job exceed the limit and the
+        # prebuilt path falls back to source build.
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          # Withheld on PR: this step runs checked-out PR code; public GGUF still downloads.
+          HF_TOKEN: ${{ github.event_name != 'pull_request' && secrets.HF_TOKEN || '' }}
+        run: |
+          mkdir -p logs
+          set -o pipefail
+          bash install.sh --local --no-torch 2>&1 | tee logs/install.log
+
+      - name: First update should be a no-op (prebuilt already validated)
+        # `unsloth studio update --local` runs studio/setup.sh against
+        # the local repo. Right after install.sh the llama.cpp prebuilt
+        # has just been installed and validated, so the second run must
+        # take the "prebuilt up to date and validated" code path. Any
+        # source-build fallback or re-download here means setup.sh's
+        # idempotency regressed.
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          # Withheld on PR: this step runs checked-out PR code; public GGUF still downloads.
+          HF_TOKEN: ${{ github.event_name != 'pull_request' && secrets.HF_TOKEN || '' }}
+        run: |
+          set -o pipefail
+          unsloth studio update --local 2>&1 | tee logs/update.log
+          if grep -q "falling back to source build" logs/update.log; then
+            echo "::error::studio update fell back to source-build llama.cpp on a fresh install. setup.sh idempotency regressed."
+            grep -E "llama-prebuilt|llama.cpp" logs/update.log | tail -60
+            exit 1
+          fi
+          if ! grep -qE "prebuilt up to date and validated|prebuilt installed and validated" logs/update.log; then
+            echo "::error::no prebuilt up-to-date marker in update.log. Did setup.sh skip the prebuilt path on update?"
+            grep -E "llama-prebuilt|llama.cpp" logs/update.log | tail -60
+            exit 1
+          fi
+          echo "update path took the prebuilt fast path"
+
+      - name: Second update must also be a no-op
+        # Two consecutive `update`s back-to-back is the usual desktop
+        # flow (auto-update, then user-triggered update). Asserting the
+        # second run is also clean rules out hidden state changes from
+        # the first one.
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          # Withheld on PR: this step runs checked-out PR code; public GGUF still downloads.
+          HF_TOKEN: ${{ github.event_name != 'pull_request' && secrets.HF_TOKEN || '' }}
+        run: |
+          set -o pipefail
+          unsloth studio update --local 2>&1 | tee logs/update2.log
+          grep -q "falling back to source build" logs/update2.log && {
+              echo "::error::second update fell back to source build"
+              tail -60 logs/update2.log; exit 1; } || true
+          grep -qE "prebuilt up to date and validated|prebuilt installed and validated" logs/update2.log
+          echo "second update was clean"
+
+      - name: Boot Studio briefly to confirm the install is still usable
+        # If `update --local` accidentally broke the venv or wiped the
+        # llama-server binary, the server would fail to start here.
+        run: |
+          mkdir -p logs
+          UNSLOTH_API_ONLY=1 unsloth studio -H 127.0.0.1 -p 18891 \
+            > logs/studio.log 2>&1 &
+          PID=$!
+          for i in $(seq 1 60); do
+            if curl -fs http://127.0.0.1:18891/api/health > /tmp/health.json; then
+              jq -e '.status == "healthy"' /tmp/health.json
+              break
+            fi
+            sleep 1
+          done
+          if ! jq -e '.status == "healthy"' /tmp/health.json 2>/dev/null; then
+            echo "Studio failed to come up after `update`"
+            tail -200 logs/studio.log
+            kill "$PID" 2>/dev/null || true
+            exit 1
+          fi
+          kill "$PID" 2>/dev/null || true
+          echo "post-update Studio /api/health OK"
+
+      - name: Uninstall and verify clean
+        # Round-trip the installer through scripts/uninstall.sh: confirms the
+        # uninstaller actually finds and removes everything install.sh +
+        # update wrote. Safety-guard scenarios (refuse-$HOME etc.) belong
+        # in a separate fast smoke job; this is the happy-path cleanup
+        # assertion that catches regressions where install.sh starts
+        # writing to a new location and scripts/uninstall.sh hasn't caught up.
+        # Skips gracefully if scripts/uninstall.sh has not landed yet (lets
+        # this workflow merge before #5497).
+        run: |
+          set -o pipefail
+          if [ ! -f scripts/uninstall.sh ]; then
+            echo "scripts/uninstall.sh not present in this tree; skipping round-trip"
+            : > logs/uninstall.log
+            exit 0
+          fi
+          sh scripts/uninstall.sh 2>&1 | tee logs/uninstall.log
+          leak=0
+          for p in \
+            "$HOME/.unsloth/studio" \
+            "$HOME/.local/share/unsloth" \
+            "$HOME/Desktop/Unsloth Studio.desktop" \
+            "$HOME/.local/bin/unsloth"; do
+            if [ -e "$p" ] || [ -L "$p" ]; then
+              echo "::error::leak: $p"
+              ls -la "$p" 2>&1 | head -3
+              leak=$((leak + 1))
+            fi
+          done
+          [ "$leak" -eq 0 ] || exit 1
+          # Idempotent: re-runs exit 0 on an empty $HOME.
+          sh scripts/uninstall.sh 2>&1 | tail -5
+          sh scripts/uninstall.sh 2>&1 | tail -5
+          echo "PASS: install -> update -> uninstall round-trip clean"
+
+      - name: Upload update logs
+        # Always upload so a green run still leaves the install + two
+        # update logs + uninstall log reviewable.
+        if: always()
+        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
+        with:
+          name: studio-update-log
+          path: |
+            logs/install.log
+            logs/update.log
+            logs/update2.log
+            logs/studio.log
+            logs/uninstall.log
+          retention-days: 7
@@ -0,0 +1,236 @@
+# SPDX-License-Identifier: AGPL-3.0-only
+# Copyright 2026-present the Unsloth AI Inc. team. All rights reserved.
+
+# Windows counterpart to studio-api-smoke.yml / studio-mac-api-smoke.yml.
+# Same tests/studio/studio_api_smoke.py exercise (CORS hardening, auth
+# state machine, JWT expiry, API key lifecycle, /v1/models /
+# /v1/embeddings / /v1/responses, endpoint-by-endpoint auth audit) but
+# on the FREE windows-latest runner. The file-mode hardening section
+# (Section 6) is Linux-only and short-circuits on non-POSIX; the rest
+# is platform-portable.
+
+name: Windows Studio API CI
+
+on:
+  pull_request:
+    paths:
+      - 'studio/**'
+      - 'unsloth/**'
+      - 'unsloth_cli/**'
+      - 'install.ps1'
+      - 'pyproject.toml'
+      - 'tests/studio/**'
+      - '.github/workflows/studio-windows-api-smoke.yml'
+  push:
+    branches: [main, pip]
+  workflow_dispatch:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+jobs:
+  api-smoke:
+    name: Studio API & Auth Tests
+    runs-on: windows-latest
+    timeout-minutes: 30
+    defaults:
+      run:
+        shell: bash
+    env:
+      GGUF_REPO: unsloth/gemma-3-270m-it-GGUF
+      GGUF_VARIANT: UD-Q4_K_XL
+      GGUF_FILE: gemma-3-270m-it-UD-Q4_K_XL.gguf
+      STUDIO_PORT: '18895'
+      HF_HOME: ${{ github.workspace }}/hf-cache
+      # Force UTF-8 for stdio (Windows defaults to cp1252; hf
+      # download prints a "✓" checkmark and crashes otherwise).
+      PYTHONIOENCODING: utf-8
+      PYTHONUTF8: '1'
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
+
+      - uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e  # v6.4.0
+        with:
+          node-version: '22'
+
+      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
+        with:
+          python-version: '3.12'
+
+      - name: Restore HF_HOME for ${{ env.GGUF_REPO }}
+        id: cache-hf
+        uses: actions/cache/restore@27d5ce7f107fe9357f9df03efb73ab90386fccae  # v5.0.5
+        continue-on-error: true
+        with:
+          path: hf-cache
+          key: ${{ runner.os }}-hf-${{ env.GGUF_REPO }}-${{ env.GGUF_VARIANT }}-v2
+
+      - name: Prime HF_HOME with the GGUF
+        id: prime-hf
+        if: steps.cache-hf.outputs.cache-hit != 'true' || steps.cache-hf.outcome != 'success'
+        env:
+          # Withheld on PR: this step runs checked-out PR code; public GGUF still downloads.
+          HF_TOKEN: ${{ github.event_name != 'pull_request' && secrets.HF_TOKEN || '' }}
+        run: |
+          python -m pip install --upgrade huggingface_hub
+          mkdir -p hf-cache
+          bash .github/scripts/hf-download-with-retry.sh "$GGUF_REPO" "$GGUF_FILE"
+          bash .github/scripts/hf-download-with-retry.sh ggml-org/models tinyllamas/stories260K.gguf
+
+      - name: Save HF_HOME for ${{ env.GGUF_REPO }}
+        if: always() && steps.prime-hf.outcome == 'success'
+        uses: actions/cache/save@27d5ce7f107fe9357f9df03efb73ab90386fccae  # v5.0.5
+        with:
+          path: hf-cache
+          key: ${{ runner.os }}-hf-${{ env.GGUF_REPO }}-${{ env.GGUF_VARIANT }}-v2
+
+      - name: Pre-install Windows tweaks (npm 11 + Defender exclusions)
+        shell: pwsh
+        # See studio-windows-update-smoke.yml for the full rationale.
+        # tl;dr: setup.ps1 needs npm >=11 to skip a 35 s winget Node
+        # reinstall, and Defender's real-time scan dominates the
+        # frontend / uv-pip-extract steps.
+        run: |
+          $ProgressPreference = 'SilentlyContinue'
+          Write-Host "npm version before upgrade: $(npm -v)"
+          npm install -g 'npm@^11' 2>&1 | Out-Host
+          Write-Host "npm version after upgrade: $(npm -v)"
+          # NOTE: do NOT pre-create these directories. See
+          # studio-windows-update-smoke.yml for the full rationale --
+          # creating an empty studio/frontend/dist trips setup.ps1's
+          # mtime-based staleness check into "frontend up to date, skip
+          # rebuild" and Studio boots with an empty dist directory.
+          # Add-MpPreference accepts paths that do not yet exist.
+          foreach ($p in @(
+            "$env:USERPROFILE\.unsloth",
+            "$env:USERPROFILE\AppData\Local\uv",
+            "$env:GITHUB_WORKSPACE\studio\frontend\node_modules",
+            "$env:GITHUB_WORKSPACE\studio\frontend\dist"
+          )) {
+            try {
+              Add-MpPreference -ExclusionPath $p -ErrorAction Stop
+              Write-Host "Defender exclusion added: $p"
+            } catch {
+              Write-Host "Defender exclusion skipped ($($_.Exception.Message)): $p"
+            }
+          }
+
+      - name: Install Studio (--local, --no-torch)
+        shell: pwsh
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          # Withheld on PR: this step runs checked-out PR code; public GGUF still downloads.
+          HF_TOKEN: ${{ github.event_name != 'pull_request' && secrets.HF_TOKEN || '' }}
+        run: |
+          New-Item -ItemType Directory -Force -Path logs | Out-Null
+          # *>&1 captures Write-Host (Information stream) output;
+          # plain 2>&1 does not. setup.ps1 emits "prebuilt installed
+          # and validated" via Write-Host, and we grep for that.
+          $ProgressPreference = 'SilentlyContinue'
+          & ./install.ps1 --local --no-torch *>&1 | Tee-Object -FilePath logs/install.log
+
+      - name: Assert install.ps1 used the Windows llama.cpp prebuilt
+        run: |
+          # Filesystem-based check (setup.ps1's stream output isn't
+          # captured back through this parent step's pipeline; see
+          # studio-windows-ui-smoke.yml for full explanation).
+          LLAMA_DIR=~/.unsloth/llama.cpp
+          INFO="$LLAMA_DIR/UNSLOTH_PREBUILT_INFO.json"
+          BIN="$LLAMA_DIR/build/bin/Release/llama-server.exe"
+          if grep -q "falling back to source build" logs/install.log; then
+            echo "::error::install.ps1 fell back to source-build llama.cpp on Windows."
+            grep -E "llama-prebuilt|llama.cpp" logs/install.log | tail -60
+            exit 1
+          fi
+          if [ ! -f "$INFO" ]; then
+            echo "::error::no UNSLOTH_PREBUILT_INFO.json at $INFO."
+            ls -la "$LLAMA_DIR" || true
+            exit 1
+          fi
+          if [ ! -f "$BIN" ]; then
+            echo "::error::no llama-server.exe at $BIN."
+            ls -la "$LLAMA_DIR/build/bin" || true
+            exit 1
+          fi
+          echo "install.ps1 installed the Windows prebuilt llama.cpp:"
+          cat "$INFO"
+
+      - name: Add Studio shim to GITHUB_PATH
+        # install.ps1's User-PATH update doesn't propagate to a
+        # running Git Bash session; export the shim dir so the
+        # next `unsloth ...` invocation finds it.
+        run: |
+          SHIM_DIR=~/.unsloth/studio/bin
+          if [ ! -f "$SHIM_DIR/unsloth.exe" ]; then
+            echo "::error::unsloth.exe shim not found at $SHIM_DIR"
+            ls -la ~/.unsloth/studio/ || true
+            exit 1
+          fi
+          cygpath -w "$SHIM_DIR" >> "$GITHUB_PATH"
+
+      - name: Install pyjwt for the JWT-expiry forge test
+        run: python -m pip install 'pyjwt>=2.6'
+
+      - name: Reset auth + boot Studio (API-only)
+        run: |
+          unsloth studio reset-password
+          mkdir -p logs
+          UNSLOTH_API_ONLY=1 unsloth studio -H 127.0.0.1 -p "$STUDIO_PORT" \
+            > logs/studio.log 2>&1 &
+          echo "STUDIO_PID=$!" >> "$GITHUB_ENV"
+
+      - name: Wait for /api/health
+        run: |
+          for i in $(seq 1 180); do
+            if curl -fs "http://127.0.0.1:${STUDIO_PORT}/api/health" > /tmp/health.json; then
+              jq -e '.status == "healthy"' /tmp/health.json && break
+            fi
+            sleep 1
+          done
+          jq -e '.status == "healthy"' /tmp/health.json
+
+      - name: Pass bootstrap password + rotated targets to the test
+        run: |
+          OLD=$(cat ~/.unsloth/studio/auth/.bootstrap_password)
+          NEW="ApiSmoke-$(python -c 'import secrets; print(secrets.token_urlsafe(16))')"
+          NEW2="ApiSmoke-$(python -c 'import secrets; print(secrets.token_urlsafe(16))')"
+          echo "::add-mask::$OLD"
+          echo "::add-mask::$NEW"
+          echo "::add-mask::$NEW2"
+          echo "STUDIO_OLD_PW=$OLD"  >> "$GITHUB_ENV"
+          echo "STUDIO_NEW_PW=$NEW"  >> "$GITHUB_ENV"
+          echo "STUDIO_NEW2_PW=$NEW2" >> "$GITHUB_ENV"
+
+      - name: Run Studio API & Auth tests
+        # Do NOT pin STUDIO_AUTH_DIR here. The Mac/Linux mirrors
+        # hardcode runner-specific paths (/Users/runner/...,
+        # /home/runner/...), but on Windows the path is
+        # C:\Users\runneradmin\.unsloth\studio\auth and varies by
+        # runner image. studio_api_smoke.py defaults to
+        # Path.home()/".unsloth"/"studio"/"auth" when the env is
+        # unset, which is correct on every OS.
+        env:
+          BASE_URL: http://127.0.0.1:18895
+        run: python tests/studio/studio_api_smoke.py
+
+      - name: Stop Studio
+        if: always()
+        run: |
+          kill "${STUDIO_PID}" 2>/dev/null || true
+          sleep 2
+
+      - name: Upload API smoke logs
+        if: always()
+        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
+        with:
+          name: windows-studio-api-smoke-log
+          path: |
+            logs/install.log
+            logs/studio.log
+          retention-days: 7
@@ -0,0 +1,406 @@
+# SPDX-License-Identifier: AGPL-3.0-only
+# Copyright 2026-present the Unsloth AI Inc. team. All rights reserved.
+
+# Windows counterpart to studio-ui-smoke.yml / studio-mac-ui-smoke.yml.
+# Same Playwright + Chromium end-to-end chat UI flow + extra UI flow,
+# but on the FREE windows-latest runner so we catch Windows-specific
+# regressions in the install path (install.ps1), the Studio CLI's
+# Windows process-management branches, and the llama.cpp prebuilt's
+# Windows HTTP layer.
+
+name: Windows Studio UI CI
+
+on:
+  pull_request:
+    paths:
+      - 'studio/**'
+      - 'unsloth/**'
+      - 'unsloth_cli/**'
+      - 'install.ps1'
+      - 'pyproject.toml'
+      - 'tests/studio/**'
+      - '.github/workflows/studio-windows-ui-smoke.yml'
+  push:
+    branches: [main, pip]
+  workflow_dispatch:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+jobs:
+  ui-smoke:
+    name: Chat UI Tests
+    runs-on: windows-latest
+    timeout-minutes: 45
+    # Default every step's shell to Git Bash. windows-latest's default
+    # shell is pwsh; without this each curl / heredoc / `kill $PID`
+    # step would need its own `shell: bash`. Steps that genuinely
+    # need PowerShell (install.ps1 invocation) override per-step.
+    defaults:
+      run:
+        shell: bash
+    env:
+      GGUF_REPO: unsloth/gemma-3-270m-it-GGUF
+      GGUF_VARIANT: UD-Q4_K_XL
+      GGUF_FILE: gemma-3-270m-it-UD-Q4_K_XL.gguf
+      STUDIO_PORT: '18896'
+      HF_HOME: ${{ github.workspace }}/hf-cache
+      # Force UTF-8 for stdio so Python tools (hf download, Studio
+      # CLI, etc.) can print Unicode characters like the success
+      # checkmark "✓". Windows defaults to cp1252 / charmap and
+      # any tool that prints "OK ✓" hits a UnicodeEncodeError.
+      PYTHONIOENCODING: utf-8
+      PYTHONUTF8: '1'
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
+
+      - uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e  # v6.4.0
+        with:
+          node-version: '22'
+          # No `cache: 'npm'`. setup-node's npm cache restore silently
+          # aborts the entire job on Windows runners when the npm cache
+          # path (`C:\npm\cache` per `npm config get cache`) doesn't yet
+          # exist on a fresh runner -- the step exits without an error
+          # message and every following step gets skipped. See
+          # npm/cli#7308. The frontend `npm ci` is fast enough without
+          # the cache that the reliability gain is worth the ~30s.
+
+      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
+        with:
+          python-version: '3.12'
+          # No `cache: 'pip'`. install.ps1 / setup.ps1 use uv and
+          # never populate ~/.cache/pip; setup-python's post-step
+          # then fatal-errors with "Cache folder path is retrieved
+          # for pip but doesn't exist on disk".
+
+      - name: Restore HF_HOME for ${{ env.GGUF_REPO }}
+        id: cache-hf
+        uses: actions/cache/restore@27d5ce7f107fe9357f9df03efb73ab90386fccae  # v5.0.5
+        continue-on-error: true
+        with:
+          path: hf-cache
+          key: ${{ runner.os }}-hf-${{ env.GGUF_REPO }}-${{ env.GGUF_VARIANT }}-v2
+
+      - name: Prime HF_HOME with the GGUF
+        id: prime-hf
+        if: steps.cache-hf.outputs.cache-hit != 'true' || steps.cache-hf.outcome != 'success'
+        env:
+          # Withheld on PR: this step runs checked-out PR code; public GGUF still downloads.
+          HF_TOKEN: ${{ github.event_name != 'pull_request' && secrets.HF_TOKEN || '' }}
+        run: |
+          python -m pip install --upgrade huggingface_hub
+          mkdir -p hf-cache
+          bash .github/scripts/hf-download-with-retry.sh "$GGUF_REPO" "$GGUF_FILE"
+          bash .github/scripts/hf-download-with-retry.sh ggml-org/models tinyllamas/stories260K.gguf
+
+      - name: Save HF_HOME for ${{ env.GGUF_REPO }}
+        if: always() && steps.prime-hf.outcome == 'success'
+        uses: actions/cache/save@27d5ce7f107fe9357f9df03efb73ab90386fccae  # v5.0.5
+        with:
+          path: hf-cache
+          key: ${{ runner.os }}-hf-${{ env.GGUF_REPO }}-${{ env.GGUF_VARIANT }}-v2
+
+      - name: Pre-install Windows tweaks (npm 11 + Defender exclusions)
+        shell: pwsh
+        # See studio-windows-update-smoke.yml for the full rationale.
+        # tl;dr: setup.ps1 needs npm >=11 to skip a 35 s winget Node
+        # reinstall, and Defender's real-time scan dominates the
+        # frontend / uv-pip-extract steps.
+        run: |
+          $ProgressPreference = 'SilentlyContinue'
+          Write-Host "npm version before upgrade: $(npm -v)"
+          npm install -g 'npm@^11' 2>&1 | Out-Host
+          Write-Host "npm version after upgrade: $(npm -v)"
+          # NOTE: do NOT pre-create these directories. See
+          # studio-windows-update-smoke.yml for the full rationale --
+          # creating an empty studio/frontend/dist trips setup.ps1's
+          # mtime-based staleness check into "frontend up to date, skip
+          # rebuild" and Studio boots with an empty dist directory.
+          # Add-MpPreference accepts paths that do not yet exist.
+          foreach ($p in @(
+            "$env:USERPROFILE\.unsloth",
+            "$env:USERPROFILE\AppData\Local\uv",
+            "$env:GITHUB_WORKSPACE\studio\frontend\node_modules",
+            "$env:GITHUB_WORKSPACE\studio\frontend\dist"
+          )) {
+            try {
+              Add-MpPreference -ExclusionPath $p -ErrorAction Stop
+              Write-Host "Defender exclusion added: $p"
+            } catch {
+              Write-Host "Defender exclusion skipped ($($_.Exception.Message)): $p"
+            }
+          }
+
+      - name: Seed a legacy launch-studio.vbs (upgrade-cleanup check)
+        # Simulate a pre-hardening install so the post-install assertion below
+        # proves the installer DELETES an existing launch-studio.vbs (the exact
+        # Kaspersky-flagged file), not merely stops generating it.
+        shell: pwsh
+        run: |
+          $appDir = Join-Path $env:LOCALAPPDATA 'Unsloth Studio'
+          New-Item -ItemType Directory -Force -Path $appDir | Out-Null
+          Set-Content -LiteralPath (Join-Path $appDir 'launch-studio.vbs') -Value 'WScript.Echo "legacy"' -Encoding Unicode
+          Write-Host "seeded legacy launch-studio.vbs at $appDir"
+
+      - name: Install Studio (--local, --no-torch)
+        # install.ps1 is the supported Windows installer. install.sh
+        # has no Windows branch (apt-get / brew calls). The PS1
+        # script's `Install-UnslothStudio @args` line at the bottom
+        # forwards `--local --no-torch` correctly.
+        shell: pwsh
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          # Withheld on PR: this step runs checked-out PR code; public GGUF still downloads.
+          HF_TOKEN: ${{ github.event_name != 'pull_request' && secrets.HF_TOKEN || '' }}
+        run: |
+          New-Item -ItemType Directory -Force -Path logs | Out-Null
+          # *>&1 redirects ALL PowerShell streams (stdout, stderr,
+          # warning, verbose, debug, information) into the success
+          # stream so Tee-Object captures everything. install.ps1
+          # and setup.ps1 emit step/substep markers via Write-Host
+          # which lands on the Information stream (PS 5+); without
+          # the wildcard redirect, those markers (including
+          # "prebuilt installed and validated") never reach
+          # logs/install.log and the post-step grep asserter fails.
+          $ProgressPreference = 'SilentlyContinue'
+          & ./install.ps1 --local --no-torch *>&1 | Tee-Object -FilePath logs/install.log
+
+      - name: Assert install.ps1 used the Windows llama.cpp prebuilt
+        run: |
+          # install.ps1's setup.ps1 child writes "prebuilt installed
+          # and validated" to its own console host -- that output
+          # does NOT come back through this parent step's stdout
+          # pipeline (no matter how aggressively we redirect: *>&1,
+          # tee, etc.). Verify the install via the filesystem
+          # instead. setup.ps1 writes UNSLOTH_PREBUILT_INFO.json
+          # next to the install dir on success, and lays the
+          # binaries under build/bin/Release/ on Windows.
+          STUDIO_HOME=~/.unsloth/studio
+          LLAMA_DIR=~/.unsloth/llama.cpp
+          INFO="$LLAMA_DIR/UNSLOTH_PREBUILT_INFO.json"
+          BIN="$LLAMA_DIR/build/bin/Release/llama-server.exe"
+          # Source-build fallback grep stays as a fast bail-out.
+          if grep -q "falling back to source build" logs/install.log; then
+            echo "::error::install.ps1 fell back to source-build llama.cpp on Windows."
+            grep -E "llama-prebuilt|llama.cpp" logs/install.log | tail -60
+            exit 1
+          fi
+          if [ ! -f "$INFO" ]; then
+            echo "::error::no UNSLOTH_PREBUILT_INFO.json at $INFO; setup.ps1 didn't install the prebuilt."
+            ls -la "$LLAMA_DIR" || true
+            exit 1
+          fi
+          if [ ! -f "$BIN" ]; then
+            echo "::error::no llama-server.exe at $BIN; prebuilt extraction incomplete."
+            ls -la "$LLAMA_DIR/build/bin" || true
+            ls -la "$LLAMA_DIR/build/bin/Release" || true
+            exit 1
+          fi
+          echo "install.ps1 installed the Windows prebuilt llama.cpp:"
+          cat "$INFO"
+
+      - name: Assert Studio launcher chain (no VBS, hidden PowerShell shortcut)
+        # The shortcut launch path is otherwise untested here (the steps below
+        # boot `unsloth studio` directly). Guard against re-introducing the VBS
+        # that tripped Kaspersky HEUR:Trojan.VBS.Agent.gen and against the .lnk
+        # pointing anywhere other than hidden PowerShell over launch-studio.ps1.
+        shell: pwsh
+        run: |
+          $appDir = Join-Path $env:LOCALAPPDATA 'Unsloth Studio'
+          if (Test-Path -LiteralPath (Join-Path $appDir 'launch-studio.vbs')) {
+            throw "regression: launch-studio.vbs exists (the Kaspersky VBS-FP shape)"
+          }
+          if (-not (Test-Path -LiteralPath (Join-Path $appDir 'launch-studio.ps1'))) {
+            throw "missing launch-studio.ps1 in $appDir"
+          }
+          $lnk = Join-Path ([Environment]::GetFolderPath('Desktop')) 'Unsloth Studio.lnk'
+          if (-not (Test-Path -LiteralPath $lnk)) {
+            $lnk = Join-Path $env:APPDATA 'Microsoft\Windows\Start Menu\Programs\Unsloth Studio.lnk'
+          }
+          if (-not (Test-Path -LiteralPath $lnk)) { throw "no Unsloth Studio.lnk on Desktop or Start Menu" }
+          $sc = (New-Object -ComObject WScript.Shell).CreateShortcut($lnk)
+          Write-Host "shortcut target: $($sc.TargetPath)"
+          Write-Host "shortcut args:   $($sc.Arguments)"
+          if ($sc.TargetPath -match 'wscript\.exe$') { throw "shortcut still targets wscript.exe (VBS host)" }
+          if ($sc.TargetPath -notmatch 'powershell\.exe$') { throw "unexpected shortcut target: $($sc.TargetPath)" }
+          if ($sc.Arguments -notmatch '-WindowStyle Hidden') {
+            throw "shortcut must launch windowless (-WindowStyle Hidden)"
+          }
+          Write-Host "launcher chain OK (no VBS; hidden powershell over launch-studio.ps1)"
+
+      - name: Launch Studio via the shortcut and assert health
+        # Run the exact command the .lnk stores (hidden PowerShell over
+        # launch-studio.ps1) and confirm it brings the backend up. This is the
+        # only step that proves the shortcut launch is not silently broken.
+        # Default port range is 8888-8908; the later UI tests use 18896/18897, so
+        # there is no conflict, and we tear this server down before they boot.
+        shell: pwsh
+        run: |
+          $lnk = Join-Path ([Environment]::GetFolderPath('Desktop')) 'Unsloth Studio.lnk'
+          if (-not (Test-Path -LiteralPath $lnk)) {
+            $lnk = Join-Path $env:APPDATA 'Microsoft\Windows\Start Menu\Programs\Unsloth Studio.lnk'
+          }
+          $sc = (New-Object -ComObject WScript.Shell).CreateShortcut($lnk)
+          Write-Host "launching: $($sc.TargetPath) $($sc.Arguments)"
+          Start-Process -FilePath $sc.TargetPath -ArgumentList $sc.Arguments -WorkingDirectory $sc.WorkingDirectory
+          $foundPort = 0
+          foreach ($i in 1..180) {
+            foreach ($port in 8888..8908) {
+              try {
+                $r = Invoke-RestMethod -Uri "http://127.0.0.1:$port/api/health" -TimeoutSec 1
+                if ($r.status -eq 'healthy' -and $r.service -eq 'Unsloth UI Backend') { $foundPort = $port; break }
+              } catch {}
+            }
+            if ($foundPort) { break }
+            Start-Sleep -Seconds 1
+          }
+          # Tear down the shortcut-launched server before the main UI tests boot.
+          try {
+            $owner = (Get-NetTCPConnection -LocalPort $foundPort -State Listen -ErrorAction Stop | Select-Object -First 1).OwningProcess
+            if ($owner) { taskkill /PID $owner /T /F 2>$null | Out-Null }
+          } catch {}
+          if (-not $foundPort) { throw "Studio did not become healthy when launched via the shortcut" }
+          Write-Host "Studio healthy on port $foundPort (launched via the shortcut)"
+
+      - name: Add Studio shim to GITHUB_PATH
+        # install.ps1 puts unsloth.exe at $StudioHome\bin\unsloth.exe
+        # and adds that dir to the User PATH via the Windows registry.
+        # Registry-level PATH updates don't propagate to a running
+        # Git Bash session, so the next step's `unsloth ...` invocation
+        # would hit "command not found". Re-export the shim dir to
+        # GITHUB_PATH so every subsequent step in this job sees it.
+        run: |
+          SHIM_DIR=~/.unsloth/studio/bin
+          if [ ! -f "$SHIM_DIR/unsloth.exe" ]; then
+            echo "::error::unsloth.exe shim not found at $SHIM_DIR"
+            ls -la ~/.unsloth/studio/ || true
+            exit 1
+          fi
+          # GITHUB_PATH wants Windows-style paths; convert via cygpath.
+          cygpath -w "$SHIM_DIR" >> "$GITHUB_PATH"
+          echo "Added Studio shim dir to PATH: $(cygpath -w "$SHIM_DIR")"
+
+      - name: Install Playwright + Chromium
+        # No --with-deps on Windows: that flag installs Linux apt
+        # packages. windows-latest ships the system frameworks
+        # Chromium needs (Edge / WebView2) already.
+        run: |
+          python -m pip install 'playwright>=1.45'
+          python -m playwright install chromium
+
+      - name: Reset auth + boot Studio
+        run: |
+          unsloth studio reset-password
+          mkdir -p logs
+          UNSLOTH_API_ONLY=1 unsloth studio -H 127.0.0.1 -p "$STUDIO_PORT" \
+            > logs/studio.log 2>&1 &
+          echo "STUDIO_PID=$!" >> "$GITHUB_ENV"
+
+      - name: Wait for /api/health
+        run: |
+          for i in $(seq 1 180); do
+            if curl -fs "http://127.0.0.1:${STUDIO_PORT}/api/health" > /tmp/health.json; then
+              jq -e '.status == "healthy"' /tmp/health.json && break
+            fi
+            sleep 1
+          done
+          jq -e '.status == "healthy"' /tmp/health.json
+
+      - name: Pass bootstrap password to the Playwright step
+        run: |
+          OLD=$(cat ~/.unsloth/studio/auth/.bootstrap_password)
+          NEW="CIUi-$(python -c 'import secrets; print(secrets.token_urlsafe(16))')"
+          NEW2="CIUi-$(python -c 'import secrets; print(secrets.token_urlsafe(16))')"
+          echo "::add-mask::$OLD"
+          echo "::add-mask::$NEW"
+          echo "::add-mask::$NEW2"
+          echo "STUDIO_OLD_PW=$OLD"   >> "$GITHUB_ENV"
+          echo "STUDIO_NEW_PW=$NEW"   >> "$GITHUB_ENV"
+          echo "STUDIO_NEW2_PW=$NEW2" >> "$GITHUB_ENV"
+
+      - name: Drive the chat UI with Playwright
+        env:
+          BASE_URL: http://127.0.0.1:18896
+          PW_ART_DIR: logs/playwright
+          STUDIO_UI_STRICT: '1'
+          # windows-latest free runner is 4 vCPU / 16 GB; gemma-3-
+          # 270m turn latency under llama-server's CPU backend can
+          # crowd the 180s default (slower than ubuntu-latest on
+          # the same model). Keep the same generous budget the Mac
+          # job uses.
+          STUDIO_UI_TURN_TIMEOUT_MS: '540000'
+        run: |
+          mkdir -p logs/playwright
+          python tests/studio/playwright_chat_ui.py
+
+      - name: Stop Studio (chat-ui ends with Shutdown click; this is belt-and-suspenders)
+        if: always()
+        run: |
+          kill "${STUDIO_PID}" 2>/dev/null || true
+          sleep 2
+
+      - name: Reset auth + boot Studio for extra UI tests (port 18897)
+        run: |
+          unsloth studio reset-password
+          mkdir -p logs
+          UNSLOTH_API_ONLY=1 unsloth studio -H 127.0.0.1 -p 18897 \
+            > logs/studio_extra.log 2>&1 &
+          echo "STUDIO_EXTRA_PID=$!" >> "$GITHUB_ENV"
+
+      - name: Wait for /api/health on 18897
+        run: |
+          for i in $(seq 1 180); do
+            if curl -fs "http://127.0.0.1:18897/api/health" > /tmp/health2.json; then
+              jq -e '.status == "healthy"' /tmp/health2.json && break
+            fi
+            sleep 1
+          done
+          jq -e '.status == "healthy"' /tmp/health2.json
+
+      - name: Pass bootstrap pw for extra UI test
+        run: |
+          OLD=$(cat ~/.unsloth/studio/auth/.bootstrap_password)
+          NEW="CIUiExtra-$(python -c 'import secrets; print(secrets.token_urlsafe(16))')"
+          echo "::add-mask::$OLD"
+          echo "::add-mask::$NEW"
+          echo "STUDIO_EXTRA_OLD_PW=$OLD" >> "$GITHUB_ENV"
+          echo "STUDIO_EXTRA_NEW_PW=$NEW" >> "$GITHUB_ENV"
+
+      - name: Drive Compare/Recipes/Export/Studio/Settings with Playwright
+        env:
+          BASE_URL: http://127.0.0.1:18897
+          STUDIO_OLD_PW: ${{ env.STUDIO_EXTRA_OLD_PW }}
+          STUDIO_NEW_PW: ${{ env.STUDIO_EXTRA_NEW_PW }}
+          PW_ART_DIR: logs/playwright_extra
+          STUDIO_UI_STRICT: '1'
+          STUDIO_UI_TURN_TIMEOUT_MS: '540000'
+          GGUF_REPO: ${{ env.GGUF_REPO }}
+          GGUF_VARIANT: ${{ env.GGUF_VARIANT }}
+        run: |
+          mkdir -p logs/playwright_extra
+          python tests/studio/playwright_extra_ui.py
+
+      - name: Stop second Studio
+        if: always()
+        run: |
+          kill "${STUDIO_EXTRA_PID}" 2>/dev/null || true
+          sleep 2
+
+      - name: Upload Playwright artifacts
+        if: always()
+        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
+        with:
+          name: windows-studio-ui-smoke-artifacts
+          path: |
+            logs/studio.log
+            logs/studio_extra.log
+            logs/install.log
+            logs/playwright
+            logs/playwright_extra
+          retention-days: 7
@@ -0,0 +1,295 @@
+# SPDX-License-Identifier: AGPL-3.0-only
+# Copyright 2026-present the Unsloth AI Inc. team. All rights reserved.
+
+# Windows counterpart to studio-update-smoke.yml /
+# studio-mac-update-smoke.yml. Verifies that on the FREE
+# windows-latest runner:
+#
+#   1. install.ps1 --local --no-torch installs Studio AND auto-fetches
+#      the prebuilt llama.cpp Windows binary (app-<tag>-windows-x64-cpu
+#      from unslothai/llama.cpp). Hitting the source-build fallback is
+#      treated as an Unsloth bug -- Studio must always pick the
+#      prebuilt on Windows.
+#   2. unsloth studio update --local is idempotent. Two consecutive
+#      runs both report "prebuilt up to date and validated", no
+#      source-build fallback. The CLI's _find_setup_script picks
+#      setup.ps1 on Windows automatically.
+#   3. The installed Studio still boots and /api/health returns
+#      healthy after the update path.
+
+name: Windows Studio Update CI
+
+on:
+  pull_request:
+    paths:
+      - 'install.ps1'
+      - 'scripts/uninstall.ps1'
+      - 'studio/setup.ps1'
+      - 'studio/setup.bat'
+      - 'studio/install_python_stack.py'
+      - 'studio/install_llama_prebuilt.py'
+      - 'studio/backend/requirements/**'
+      - 'unsloth_cli/commands/studio.py'
+      - 'pyproject.toml'
+      - '.github/workflows/studio-windows-update-smoke.yml'
+  push:
+    branches: [main, pip]
+  workflow_dispatch:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+jobs:
+  update-idempotency:
+    name: Studio Updating Tests
+    runs-on: windows-latest
+    timeout-minutes: 30
+    defaults:
+      run:
+        shell: bash
+    env:
+      # Force UTF-8 for stdio (Windows defaults to cp1252; hf
+      # download / Studio CLI print "✓" checkmarks and crash
+      # otherwise).
+      PYTHONIOENCODING: utf-8
+      PYTHONUTF8: '1'
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
+
+      - uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e  # v6.4.0
+        with:
+          node-version: '22'
+
+      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
+        with:
+          python-version: '3.12'
+          # Don't cache pip: install.ps1 + setup.ps1 go through uv
+          # and never populate ~/.cache/pip; setup-python's post-step
+          # then fatal-errors with "Cache folder path is retrieved
+          # for pip but doesn't exist on disk".
+
+      - name: Pre-install Windows tweaks (npm 11 + Defender exclusions)
+        shell: pwsh
+        # Two surgical fixes against measured Windows-only install
+        # waste (vs Mac/Linux on the same SHA):
+        #
+        # (1) npm. setup.ps1's Get-NodeDecision requires Node 22.12+
+        #     (or 20.19+ / 23+) AND npm >=11 because Vite 8 needs both.
+        #     actions/setup-node@v4 with `node-version: '22'` lands
+        #     Node 22.22.2 + the npm 10.9.7 it bundles, so the decision
+        #     is "bundled" and setup.ps1 downloads an isolated Node (~30
+        #     MB) we don't need on a runner that already has a fine Node.
+        #     `npm install -g npm@^11` updates the runner's npm in-place
+        #     in ~5 s, flipping the decision to "system" so setup.ps1
+        #     reuses the existing Node with no download.
+        #
+        # (2) Defender. windows-latest's real-time scan opens / hashes
+        #     every file Studio writes during install (Vite output =
+        #     thousands of small chunks, uv pip = wheel-extraction =
+        #     thousands of small files). The latency dominates the
+        #     200 s frontend build and the 90 s deps install. Adding
+        #     ExclusionPath entries for the directories the install
+        #     writes to drops per-file open latency from ~ms to ~us.
+        #     Add-MpPreference needs admin; the runneradmin user has
+        #     it, but wrap in try/catch so a permission flake leaves
+        #     the install otherwise unaffected.
+        run: |
+          $ProgressPreference = 'SilentlyContinue'
+          Write-Host "npm version before upgrade: $(npm -v)"
+          npm install -g 'npm@^11' 2>&1 | Out-Host
+          Write-Host "npm version after upgrade: $(npm -v)"
+          # NOTE: do NOT pre-create these directories before adding the
+          # exclusion -- creating an empty studio/frontend/dist trips
+          # setup.ps1 line 1281-1296's mtime-based "is the frontend
+          # stale?" check into "up to date, skip rebuild", because the
+          # newly-created dist's mtime is younger than every source
+          # file. Studio then boots with an empty dist and 500s on
+          # GET / with FileNotFoundError: dist\index.html. See run
+          # 25546676715 / job 74984469728.
+          # Add-MpPreference accepts paths that do not yet exist; the
+          # exclusion is registered and applies when the path
+          # materialises.
+          foreach ($p in @(
+            "$env:USERPROFILE\.unsloth",
+            "$env:USERPROFILE\AppData\Local\uv",
+            "$env:GITHUB_WORKSPACE\studio\frontend\node_modules",
+            "$env:GITHUB_WORKSPACE\studio\frontend\dist"
+          )) {
+            try {
+              Add-MpPreference -ExclusionPath $p -ErrorAction Stop
+              Write-Host "Defender exclusion added: $p"
+            } catch {
+              Write-Host "Defender exclusion skipped ($($_.Exception.Message)): $p"
+            }
+          }
+
+      - name: Install Studio (--local, --no-torch)
+        shell: pwsh
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          # Withheld on PR: this step runs checked-out PR code; public GGUF still downloads.
+          HF_TOKEN: ${{ github.event_name != 'pull_request' && secrets.HF_TOKEN || '' }}
+        run: |
+          New-Item -ItemType Directory -Force -Path logs | Out-Null
+          # *>&1 captures Write-Host (Information stream) output;
+          # plain 2>&1 does not. setup.ps1 emits "prebuilt installed
+          # and validated" via Write-Host, and we grep for that.
+          $ProgressPreference = 'SilentlyContinue'
+          & ./install.ps1 --local --no-torch *>&1 | Tee-Object -FilePath logs/install.log
+
+      - name: Assert install.ps1 used the Windows llama.cpp prebuilt
+        run: |
+          # Filesystem-based check (setup.ps1's stream output isn't
+          # captured back through the parent pipeline).
+          LLAMA_DIR=~/.unsloth/llama.cpp
+          INFO="$LLAMA_DIR/UNSLOTH_PREBUILT_INFO.json"
+          BIN="$LLAMA_DIR/build/bin/Release/llama-server.exe"
+          if grep -q "falling back to source build" logs/install.log; then
+            echo "::error::install.ps1 fell back to source-build llama.cpp on Windows."
+            grep -E "llama-prebuilt|llama.cpp" logs/install.log | tail -60
+            exit 1
+          fi
+          if [ ! -f "$INFO" ]; then
+            echo "::error::no UNSLOTH_PREBUILT_INFO.json at $INFO."
+            ls -la "$LLAMA_DIR" || true
+            exit 1
+          fi
+          if [ ! -f "$BIN" ]; then
+            echo "::error::no llama-server.exe at $BIN."
+            ls -la "$LLAMA_DIR/build/bin" || true
+            exit 1
+          fi
+          echo "install.ps1 installed the Windows prebuilt llama.cpp:"
+          cat "$INFO"
+
+      - name: Add Studio shim to GITHUB_PATH
+        run: |
+          SHIM_DIR=~/.unsloth/studio/bin
+          if [ ! -f "$SHIM_DIR/unsloth.exe" ]; then
+            echo "::error::unsloth.exe shim not found at $SHIM_DIR"
+            ls -la ~/.unsloth/studio/ || true
+            exit 1
+          fi
+          cygpath -w "$SHIM_DIR" >> "$GITHUB_PATH"
+
+      - name: First update should be a no-op (prebuilt already validated)
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          # Withheld on PR: this step runs checked-out PR code; public GGUF still downloads.
+          HF_TOKEN: ${{ github.event_name != 'pull_request' && secrets.HF_TOKEN || '' }}
+        run: |
+          set -o pipefail
+          unsloth studio update --local 2>&1 | tee logs/update.log
+          if grep -q "falling back to source build" logs/update.log; then
+            echo "::error::studio update fell back to source-build llama.cpp on Windows."
+            grep -E "llama-prebuilt|llama.cpp" logs/update.log | tail -60
+            exit 1
+          fi
+          if ! grep -qE "prebuilt up to date and validated|prebuilt installed and validated" logs/update.log; then
+            echo "::error::no prebuilt up-to-date marker in update.log."
+            grep -E "llama-prebuilt|llama.cpp" logs/update.log | tail -60
+            exit 1
+          fi
+          echo "update path took the prebuilt fast path"
+
+      - name: Second update must also be a no-op
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          # Withheld on PR: this step runs checked-out PR code; public GGUF still downloads.
+          HF_TOKEN: ${{ github.event_name != 'pull_request' && secrets.HF_TOKEN || '' }}
+        run: |
+          set -o pipefail
+          unsloth studio update --local 2>&1 | tee logs/update2.log
+          grep -q "falling back to source build" logs/update2.log && {
+              echo "::error::second update fell back to source build on Windows"
+              tail -60 logs/update2.log; exit 1; } || true
+          grep -qE "prebuilt up to date and validated|prebuilt installed and validated" logs/update2.log
+          echo "second update was clean"
+
+      - name: Boot Studio briefly to confirm the install is still usable
+        run: |
+          mkdir -p logs
+          UNSLOTH_API_ONLY=1 unsloth studio -H 127.0.0.1 -p 18891 \
+            > logs/studio.log 2>&1 &
+          PID=$!
+          HEALTHY=""
+          # Use jq (a Git Bash builtin) instead of `python -c
+          # open('/tmp/health.json')` to read the saved health
+          # response. Bash on windows-latest is MSYS Git Bash, which
+          # resolves `/tmp/...` against the MSYS root, while the
+          # python interpreter is Windows-native and resolves it
+          # against the current drive's root. The two paths don't
+          # agree, so python never finds the file curl just wrote.
+          # jq reads through MSYS, so the path matches. Mirrors what
+          # studio-windows-api-smoke.yml and the other Windows smoke
+          # workflows already do.
+          for i in $(seq 1 60); do
+            if curl -fs http://127.0.0.1:18891/api/health > /tmp/health.json; then
+              if jq -e '.status == "healthy"' /tmp/health.json >/dev/null; then
+                HEALTHY=1
+                break
+              fi
+            fi
+            sleep 1
+          done
+          if [ -z "$HEALTHY" ]; then
+            echo "Studio failed to come up after \`update\`"
+            tail -200 logs/studio.log
+            kill "$PID" 2>/dev/null || true
+            exit 1
+          fi
+          kill "$PID" 2>/dev/null || true
+          echo "post-update Studio /api/health OK"
+
+      - name: Uninstall and verify clean
+        # Round-trip through scripts/uninstall.ps1 against the default
+        # install tree at %USERPROFILE%\.unsloth\studio. Catches
+        # regressions where install.ps1 starts writing under a new key
+        # (registry, Start Menu, %APPDATA%) and scripts/uninstall.ps1 has
+        # not been updated to match. Skips gracefully if
+        # scripts/uninstall.ps1 has not landed yet (lets this workflow
+        # merge before #5513).
+        shell: pwsh
+        run: |
+          New-Item -ItemType Directory -Force -Path logs | Out-Null
+          if (-not (Test-Path "$PWD\scripts\uninstall.ps1")) {
+            Write-Host "scripts/uninstall.ps1 not present in this tree; skipping round-trip"
+            "" | Set-Content logs/uninstall.log
+            exit 0
+          }
+          pwsh -NoProfile -File "$PWD\scripts\uninstall.ps1" *>&1 | Tee-Object -FilePath logs/uninstall.log
+          $leak = 0
+          foreach ($p in @(
+            "$env:USERPROFILE\.unsloth\studio",
+            "$env:USERPROFILE\.unsloth\studio\unsloth_studio",
+            "$env:USERPROFILE\.unsloth\studio\bin\unsloth.exe"
+          )) {
+            if (Test-Path -LiteralPath $p) {
+              Write-Host "::error::leak: $p"
+              $leak++
+            }
+          }
+          if ($leak -gt 0) { exit 1 }
+          # Idempotency.
+          pwsh -NoProfile -File "$PWD\scripts\uninstall.ps1" *>&1 | Select-Object -Last 5
+          pwsh -NoProfile -File "$PWD\scripts\uninstall.ps1" *>&1 | Select-Object -Last 5
+          Write-Host "PASS: windows install -> update -> uninstall round-trip clean"
+
+      - name: Upload update logs
+        if: always()
+        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
+        with:
+          name: windows-studio-update-log
+          path: |
+            logs/install.log
+            logs/update.log
+            logs/update2.log
+            logs/studio.log
+            logs/uninstall.log
+          retention-days: 7
@@ -0,0 +1,398 @@
+# SPDX-License-Identifier: AGPL-3.0-only
+# Copyright 2026-present the Unsloth AI Inc. team. All rights reserved.
+#
+# Cross-version compat canary for the four upstream packages whose
+# release cadence regularly breaks unsloth + unsloth-zoo:
+#
+#   1. vLLM             (LoRA worker manager, BnB loader, cumem allocator)
+#   2. TRL / GRPO       (trainer source rewriters in unsloth.models.rl*)
+#   3. PEFT             (LoraConfig, get_peft_model, LoraLayer, bnb integration)
+#   4. sentence-transformers (Transformer/Pooling/Normalize, Trainer)
+#   5. bitsandbytes     (Linear4bit, dequantize_4bit)
+#
+# Strategy: GitHub raw-fetch + symbol grep against every tracked
+# version (no pip install, CPU-only). When upstream renames a symbol
+# we depend on, the matching test fails BEFORE a user hits it. The
+# `main` branch entries give us a few-day lead on PyPI releases.
+#
+# Cross-references:
+#   tests/vllm_compat/test_vllm_pinned_symbols.py     (vLLM symbols)
+#   tests/version_compat/test_trl_grpo_pinned_symbols.py
+#   tests/version_compat/test_peft_pinned_symbols.py
+#   tests/version_compat/test_sentence_transformers_pinned_symbols.py
+#   tests/version_compat/test_bitsandbytes_pinned_symbols.py
+
+name: Version Compat CI
+
+on:
+  pull_request:
+    # Trigger on any unsloth source change, not just the three previously
+    # named files. The symbol-existence tests verify that EVERY pinned
+    # upstream reference in unsloth still resolves; a new
+    # `from peft.foo import Bar` added in unsloth/kernels/whatever.py
+    # is just as much a compat regression risk as one added in
+    # unsloth/models/rl.py.
+    paths:
+      - 'unsloth/**'
+      - 'tests/vllm_compat/**'
+      - 'tests/version_compat/**'
+      - 'pyproject.toml'
+      - '.github/workflows/version-compat-ci.yml'
+  schedule:
+    # Daily 06:43 UTC. Catches upstream PyPI releases roughly within
+    # 24 h. Off the :00 / :30 fleet-collision spots.
+    - cron: '43 6 * * *'
+  workflow_dispatch:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+jobs:
+  vllm-pinned-symbols:
+    name: vLLM pinned-symbol matrix (≥ 0.9.0 + main)
+    runs-on: ubuntu-latest
+    timeout-minutes: 12
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
+      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
+        with:
+          python-version: '3.12'
+          cache: 'pip'
+      - name: Install pytest only
+        # The test fetches from raw.githubusercontent.com and greps
+        # source. No pip install of vllm / torch / transformers is
+        # needed — that's the whole point of this canary.
+        run: |
+          python -m pip install --upgrade pip
+          pip install 'pytest>=8'
+      - name: Run vllm-compat suite
+        env:
+          # Authenticated requests get a 5000-req/h quota on raw
+          # fetches; unauthenticated is 60/h and trips on the matrix.
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          python -m pytest tests/vllm_compat/test_vllm_pinned_symbols.py -v --tb=short
+
+  trl-grpo-pinned-symbols:
+    name: TRL / GRPO pinned-symbol matrix
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
+      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
+        with:
+          python-version: '3.12'
+          cache: 'pip'
+      - name: Install pytest only
+        run: |
+          python -m pip install --upgrade pip
+          pip install 'pytest>=8'
+      - name: Run trl-compat suite
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          # PYTHONPATH=. so `from tests.version_compat._fetch import …`
+          # works without an editable install of unsloth itself.
+          PYTHONPATH=. python -m pytest \
+            tests/version_compat/test_trl_grpo_pinned_symbols.py \
+            -v --tb=short
+
+  peft-pinned-symbols:
+    name: PEFT pinned-symbol matrix (pyproject window + main)
+    runs-on: ubuntu-latest
+    timeout-minutes: 8
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
+      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
+        with:
+          python-version: '3.12'
+          cache: 'pip'
+      - name: Install pytest only
+        run: |
+          python -m pip install --upgrade pip
+          pip install 'pytest>=8'
+      - name: Run peft-compat suite
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          PYTHONPATH=. python -m pytest \
+            tests/version_compat/test_peft_pinned_symbols.py \
+            tests/version_compat/test_unsloth_zoo_save_merged_pinned_symbols.py \
+            -v --tb=short
+
+  st-pinned-symbols:
+    name: sentence-transformers pinned-symbol matrix
+    runs-on: ubuntu-latest
+    timeout-minutes: 8
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
+      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
+        with:
+          python-version: '3.12'
+          cache: 'pip'
+      - name: Install pytest only
+        run: |
+          python -m pip install --upgrade pip
+          pip install 'pytest>=8'
+      - name: Run sentence-transformers compat suite
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          PYTHONPATH=. python -m pytest \
+            tests/version_compat/test_sentence_transformers_pinned_symbols.py \
+            -v --tb=short
+
+  bitsandbytes-pinned-symbols:
+    name: bitsandbytes pinned-symbol matrix
+    runs-on: ubuntu-latest
+    timeout-minutes: 8
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
+      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
+        with:
+          python-version: '3.12'
+          cache: 'pip'
+      - name: Install pytest only
+        run: |
+          python -m pip install --upgrade pip
+          pip install 'pytest>=8'
+      - name: Run bitsandbytes compat suite
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          PYTHONPATH=. python -m pytest \
+            tests/version_compat/test_bitsandbytes_pinned_symbols.py \
+            -v --tb=short
+
+  transformers-pinned-symbols:
+    name: transformers pinned-symbol matrix (4.57.6 + 5.x + main)
+    runs-on: ubuntu-latest
+    timeout-minutes: 12
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
+      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
+        with:
+          python-version: '3.12'
+          cache: 'pip'
+      - name: Install pytest only
+        run: |
+          python -m pip install --upgrade pip
+          pip install 'pytest>=8'
+      - name: Run transformers compat suite
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          PYTHONPATH=. python -m pytest \
+            tests/version_compat/test_transformers_pinned_symbols.py \
+            -v --tb=short
+
+  # Optional second layer: actually `pip install` ONE representative
+  # version of each package and verify unsloth + unsloth-zoo modules
+  # import on it under the existing CUDA spoof. CPU-only, runs on
+  # ubuntu-latest. Catches the small set of breakages that the static
+  # symbol check misses (e.g. import-time side effects).
+  zoo-imports-under-spoof:
+    name: unsloth_zoo vllm/grpo/peft/st modules import under CUDA spoof
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
+          path: unsloth
+      - name: Clone unsloth-zoo @ main
+        run: |
+          # github.com occasionally 500s on the git fetch; retry so a
+          # single upstream blip does not fail CI.
+          for attempt in 1 2 3; do
+            rm -rf "$RUNNER_TEMP/unsloth-zoo"
+            if git clone --depth=1 https://github.com/unslothai/unsloth-zoo \
+                "$RUNNER_TEMP/unsloth-zoo"; then
+              break
+            fi
+            if [ "$attempt" -eq 3 ]; then
+              echo "::error::git clone unsloth-zoo failed after 3 attempts"
+              exit 1
+            fi
+            delay=$((5 * attempt))
+            echo "::warning::clone failed (attempt $attempt/3), retrying in ${delay}s..."
+            sleep "$delay"
+          done
+      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
+        with:
+          python-version: '3.12'
+          cache: 'pip'
+      - name: Install CPU torch + supported pkg pins
+        run: |
+          python -m pip install --upgrade pip
+          # CPU torch (vllm/peft/st all depend on it).
+          pip install --index-url https://download.pytorch.org/whl/cpu --extra-index-url https://pypi.org/simple \
+            'torch>=2.4,<2.11' 'torchvision<0.26' 'torchcodec<0.10'
+          # torchcodec is a hard requirement on transformers 5.x:
+          # transformers/audio_utils.py:55 does
+          #   `importlib.metadata.version("torchcodec")` UNCONDITIONALLY,
+          # which raises PackageNotFoundError on a CPU runner that
+          # otherwise has no audio path -- and that error trickles up
+          # through every `import unsloth_zoo.<module>` because
+          # unsloth-zoo's vision_utils transitively pulls
+          # transformers.processing_utils (-> audio_utils). The 0.10
+          # cap mirrors the torch 2.10 / torchvision 0.26 ABI window
+          # we already pin above.
+          # Ladder of supported floor versions per pyproject.toml.
+          pip install \
+            'transformers>=4.56,<5.6' 'trl>=0.22,<0.26' \
+            'peft>=0.18.0' 'sentence-transformers>=5.0' \
+            'accelerate>=1.0' 'datasets>=3.4,<5' \
+            'bitsandbytes>=0.45.5' \
+            sentencepiece protobuf safetensors numpy 'pytest>=8' \
+            'huggingface_hub>=0.34' tqdm packaging psutil triton Pillow
+          # Editable-install both repos so the test imports the
+          # checkouts (not whatever stale PyPI version pip resolved).
+          pip install --no-deps -e "$RUNNER_TEMP/unsloth-zoo"
+          pip install --no-deps -e ./unsloth
+      - name: Run vllm_compat zoo-imports tests under spoof
+        env:
+          UNSLOTH_IS_PRESENT: '1'
+          UNSLOTH_COMPILE_DISABLE: '1'
+          PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION: python
+        run: |
+          cd unsloth
+          # tests/vllm_compat/test_unsloth_zoo_imports.py: narrow vllm/grpo
+          #   import gates (5 tests).
+          # tests/vllm_compat/test_extended_module_imports.py: full sweep
+          #   of unsloth_zoo + unsloth.models.* modules + RL dispatch
+          #   table population + FastModel API surface under spoof
+          #   (~30 tests). Catches transformers / peft / bnb symbol pin
+          #   drift at module-top BEFORE any runtime call.
+          PYTHONPATH=. python -m pytest \
+            tests/vllm_compat/test_unsloth_zoo_imports.py \
+            tests/vllm_compat/test_extended_module_imports.py \
+            -v --tb=short
+
+  # Fake-CUDA GRPO/SFT/DPO patch run against REAL TRL (latest + main). Unlike
+  # the static symbol/source greps above, this drives unsloth's actual
+  # source-transform patchers (models/rl.py + rl_replacements.py) on a CPU-only
+  # runner under the tests/conftest.py spoof harness -- no GPU, no training.
+  # Catches structural TRL drift the greps miss (e.g. TRL 1.7.0's 2->3-tuple
+  # per-token-logps return, restructured PEFT ref-adapter block) by asserting
+  # the generated Unsloth trainer still satisfies the transform contracts.
+  grpo-fake-run:
+    name: GRPO fake-run (latest + main TRL, CPU spoof)
+    runs-on: ubuntu-latest
+    timeout-minutes: 18
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
+          path: unsloth
+      - name: Clone unsloth-zoo @ main
+        run: |
+          for attempt in 1 2 3; do
+            rm -rf "$RUNNER_TEMP/unsloth-zoo"
+            if git clone --depth=1 https://github.com/unslothai/unsloth-zoo \
+                "$RUNNER_TEMP/unsloth-zoo"; then
+              break
+            fi
+            if [ "$attempt" -eq 3 ]; then
+              echo "::error::git clone unsloth-zoo failed after 3 attempts"
+              exit 1
+            fi
+            delay=$((5 * attempt))
+            echo "::warning::clone failed (attempt $attempt/3), retrying in ${delay}s..."
+            sleep "$delay"
+          done
+      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
+        with:
+          python-version: '3.12'
+          cache: 'pip'
+      - name: Install CPU torch + ecosystem + TRL latest
+        run: |
+          python -m pip install --upgrade pip
+          pip install --index-url https://download.pytorch.org/whl/cpu --extra-index-url https://pypi.org/simple \
+            'torch>=2.4,<2.11' 'torchvision<0.26' 'torchcodec<0.10'
+          # Ecosystem floors unsloth needs; TRL itself is installed last so it
+          # can pull the transformers/peft it requires.
+          pip install \
+            'transformers>=4.57' 'peft>=0.18.0' 'accelerate>=1.0' 'datasets>=3.4,<5' \
+            'bitsandbytes>=0.45.5' sentencepiece protobuf safetensors numpy 'pytest>=8' \
+            'huggingface_hub>=0.34' tqdm packaging psutil triton Pillow
+          pip install --upgrade trl
+          pip install --no-deps -e "$RUNNER_TEMP/unsloth-zoo"
+          pip install --no-deps -e ./unsloth
+      - name: Fake-run vs TRL latest
+        env:
+          UNSLOTH_IS_PRESENT: '1'
+          UNSLOTH_COMPILE_DISABLE: '1'
+          # Disable dynamo/inductor at the process level, before conftest.py's early
+          # `import unsloth`, so the GRPO hot path never compiles on the GPU-less runner
+          # (defense in depth; the CPU fake-train also flips this at runtime).
+          TORCHDYNAMO_DISABLE: '1'
+          TORCH_COMPILE_DISABLE: '1'
+          PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION: python
+        run: |
+          cd unsloth
+          python -c "import trl; print('Resolved TRL', trl.__version__)"
+          PYTHONPATH=. python -m pytest \
+            tests/version_compat/test_trl_grpo_fake_run.py \
+            tests/version_compat/test_trl_fake_train_cpu.py \
+            -v --tb=short
+      # `main` is scheduled/dispatch-only so PR jobs stay fast and a bleeding-edge
+      # TRL break does not red every PR. github.event_name is valid in a step if.
+      - name: Fake-run vs TRL main (scheduled / dispatch only)
+        if: ${{ github.event_name != 'pull_request' }}
+        env:
+          UNSLOTH_IS_PRESENT: '1'
+          UNSLOTH_COMPILE_DISABLE: '1'
+          TORCHDYNAMO_DISABLE: '1'
+          TORCH_COMPILE_DISABLE: '1'
+          PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION: python
+        run: |
+          pip install --upgrade "git+https://github.com/huggingface/trl"
+          cd unsloth
+          python -c "import trl; print('Resolved TRL', trl.__version__)"
+          PYTHONPATH=. python -m pytest \
+            tests/version_compat/test_trl_grpo_fake_run.py \
+            tests/version_compat/test_trl_fake_train_cpu.py \
+            -v --tb=short
+
+  # Daily-only: same suites but with --strict on importable upstream
+  # tags. Schedule-only so PR jobs stay fast; cron tolerates a flake.
+  daily-fresh-fetch:
+    name: daily fresh-fetch sweep (cron only)
+    if: ${{ github.event_name == 'schedule' || github.event_name == 'workflow_dispatch' }}
+    runs-on: ubuntu-latest
+    timeout-minutes: 20
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
+      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
+        with:
+          python-version: '3.12'
+          cache: 'pip'
+      - name: Install pytest
+        run: pip install 'pytest>=8'
+      - name: Run all version-compat suites in one process (no cache)
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          PYTHONPATH=. python -m pytest \
+            tests/vllm_compat/test_vllm_pinned_symbols.py \
+            tests/version_compat/ \
+            -v --tb=short
@@ -0,0 +1,136 @@
+# SPDX-License-Identifier: AGPL-3.0-only
+# Copyright 2026-present the Unsloth AI Inc. team. All rights reserved.
+
+# Builds the PyPI wheel from the PR branch, then verifies the built wheel
+# actually contains what we expect to ship and does NOT contain the broken
+# Studio bundle that 2026.5.1 published. This is the single workflow that
+# would have blocked the 2026.5.1 release before twine upload.
+#
+# Verified locally end-to-end against this branch:
+#   - python -m build produces unsloth-<version>-py3-none-any.whl in 13s
+#   - wheel content sanity passes:
+#       lockfile shipped, frontend dist shipped,
+#       no node_modules in wheel, no bun.lock in wheel,
+#       main bundle has unstable_Provider hits=1 (assistant-ui internals only).
+#   - Studio backend imports cleanly from the installed wheel with the
+#     lightweight dep set below.
+
+name: Wheel CI
+
+on:
+  pull_request:
+    paths:
+      - 'pyproject.toml'
+      - 'studio/**'
+      - 'unsloth/**'
+      - 'unsloth_cli/**'
+      - '.github/workflows/wheel-smoke.yml'
+  push:
+    branches: [main, pip]
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+jobs:
+  wheel:
+    name: Wheel build + content sanity + import smoke
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
+
+      - uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e  # v6.4.0
+        with:
+          node-version: '22'
+
+      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
+        with:
+          python-version: '3.12'
+
+      - name: Lockfile supply-chain audit (pre-install scan)
+        run: python3 scripts/lockfile_supply_chain_audit.py
+
+      - name: Build frontend
+        # Lifecycle scripts (esbuild native-binary postinstall, etc.) are
+        # required for `vite build`. The pre-install lockfile structural
+        # audit (lockfile_supply_chain_audit.py) is the practical defence
+        # against the npm postinstall-dropper class -- it fires BEFORE any
+        # tarball runs, on the injection pattern itself rather than an
+        # advisory-DB lookup.
+        run: |
+          cd studio/frontend
+          npm ci --no-fund --no-audit
+          npm run build
+
+      - name: Build wheel + sdist
+        run: |
+          python -m pip install --upgrade pip build
+          rm -rf dist build ./*.egg-info
+          python -m build
+
+      - name: Wheel content sanity
+        run: |
+          python - <<'PY'
+          import zipfile, glob, sys
+          w = glob.glob("dist/unsloth-*.whl")
+          if not w:
+              print("FAIL: no wheel produced"); sys.exit(2)
+          w = w[0]
+          print(f"wheel: {w}")
+          with zipfile.ZipFile(w) as z:
+              n = z.namelist()
+              checks = {
+                "lockfile shipped":      any(s.endswith("studio/frontend/package-lock.json") for s in n),
+                "frontend dist shipped": any(s.endswith("studio/frontend/dist/index.html")    for s in n),
+                "no node_modules":       not any("studio/frontend/node_modules/" in s for s in n),
+                "no bun.lock":           not any(s.endswith("studio/frontend/bun.lock")       for s in n),
+              }
+              js = [s for s in n
+                    if "studio/frontend/dist/assets/" in s
+                    and s.endswith(".js")
+                    and "/index-" in s]
+              if not js:
+                  print("FAIL: no main bundle index-*.js in wheel"); sys.exit(2)
+              data = z.read(js[0]).decode("utf-8", "replace")
+              hits = data.count("unstable_Provider:")
+              print(f"main bundle: {js[0]}")
+              print(f"unstable_Provider hits: {hits} (>=4 indicates 2026.5.1 regression)")
+              checks["bundle has no Studio unstable_Provider call site"] = (hits < 4)
+
+              print()
+              for k, v in checks.items():
+                  print(f"  [{'PASS' if v else 'FAIL'}] {k}")
+              sys.exit(0 if all(checks.values()) else 1)
+          PY
+
+      - name: Studio backend import smoke
+        # Imports `studio.backend.main:app` from the freshly-installed wheel in
+        # a clean venv. This catches the class of bug that 2026.5.1 shipped with:
+        # frontend dist missing, package-lock.json missing, or the wheel's Python
+        # source tree broken in a way that surfaces only at app construction time.
+        run: |
+          python -m venv /tmp/v
+          /tmp/v/bin/pip install --upgrade pip
+          /tmp/v/bin/pip install -r studio/backend/requirements/studio.txt
+          /tmp/v/bin/pip install \
+            python-multipart aiofiles sqlalchemy cryptography \
+            pyyaml jinja2 mammoth unpdf requests \
+            'numpy<3'
+          /tmp/v/bin/pip install --no-deps dist/unsloth-*.whl
+          # Run from /tmp so Python imports the installed package, not the source tree.
+          cd /tmp
+          /tmp/v/bin/python -c "from studio.backend.main import app; print('Studio backend OK:', app.title)"
+
+      - name: Upload wheel on failure
+        if: failure()
+        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
+        with:
+          name: unsloth-wheel
+          path: dist/
+          retention-days: 7