chore: import upstream snapshot with attribution

scripts/install_release.sh

@@ -0,0 +1,108 @@
+#!/usr/bin/env bash
+# Install the current release binary into the immutable version store,
+# update the stable + current channel symlinks, and point the launcher at current.
+#
+# Paths after install:
+# - ~/.jcode/builds/versions/<hash>/jcode (immutable)
+# - ~/.jcode/builds/stable/jcode -> .../versions/<hash>/jcode
+# - ~/.jcode/builds/current/jcode -> .../versions/<hash>/jcode
+# - ~/.local/bin/jcode -> ~/.jcode/builds/current/jcode (launcher)
+set -euo pipefail
+
+repo_root="$(git rev-parse --show-toplevel 2>/dev/null || pwd)"
+
+profile="${JCODE_RELEASE_PROFILE:-release-lto}"
+if [[ "${1:-}" == "--fast" ]]; then
+  profile="release"
+  shift
+fi
+
+if [[ "$#" -gt 0 ]]; then
+  echo "Usage: $0 [--fast]" >&2
+  exit 1
+fi
+
+case "$profile" in
+  release-lto)
+    echo "Building with LTO (this takes a few minutes)..."
+    ;;
+  release)
+    echo "Building fast release profile (no LTO)..."
+    ;;
+  *)
+    echo "Unsupported profile: $profile (expected: release or release-lto)" >&2
+    exit 1
+    ;;
+esac
+
+cargo build --profile "$profile" --manifest-path "$repo_root/Cargo.toml"
+bin="$repo_root/target/$profile/jcode"
+
+if [[ ! -x "$bin" ]]; then
+  echo "Release binary not found: $bin" >&2
+  exit 1
+fi
+
+hash=""
+if command -v git >/dev/null 2>&1; then
+  if git -C "$repo_root" rev-parse --git-dir >/dev/null 2>&1; then
+    hash="$(git -C "$repo_root" rev-parse --short HEAD 2>/dev/null || true)"
+    if [[ -n "${hash}" ]] && [[ -n "$(git -C "$repo_root" status --porcelain 2>/dev/null || true)" ]]; then
+      hash="${hash}-dirty"
+    fi
+  fi
+fi
+
+if [[ -z "$hash" ]]; then
+  hash="$(date +%Y%m%d%H%M%S)"
+fi
+
+# Install versioned binary into ~/.jcode/builds/versions/<hash>/
+builds_dir="$HOME/.jcode/builds"
+version_dir="$builds_dir/versions/$hash"
+mkdir -p "$version_dir"
+install -m 755 "$bin" "$version_dir/jcode"
+
+# Update stable symlink
+stable_dir="$builds_dir/stable"
+mkdir -p "$stable_dir"
+ln -sfn "$version_dir/jcode" "$stable_dir/jcode"
+
+# Update stable-version marker
+printf '%s\n' "$hash" > "$builds_dir/stable-version"
+
+# Update current symlink + marker
+current_dir="$builds_dir/current"
+mkdir -p "$current_dir"
+ln -sfn "$version_dir/jcode" "$current_dir/jcode"
+printf '%s\n' "$hash" > "$builds_dir/current-version"
+
+# Update launcher path to current channel
+install_dir="${JCODE_INSTALL_DIR:-$HOME/.local/bin}"
+mkdir -p "$install_dir"
+ln -sfn "$current_dir/jcode" "$install_dir/jcode"
+
+echo "Installed: $version_dir/jcode"
+echo "Updated stable symlink: $stable_dir/jcode -> $version_dir/jcode"
+echo "Updated current symlink: $current_dir/jcode -> $version_dir/jcode"
+echo "Updated launcher symlink: $install_dir/jcode -> $current_dir/jcode"
+
+# Gracefully reload any running background server onto the binary we just
+# installed (issue #291). `server reload` only reloads when the running daemon
+# is genuinely older, hands live headless/swarm sessions to the new process, and
+# is a no-op when no server is running, so it is safe to call unconditionally.
+if [ "${JCODE_SKIP_SERVER_RELOAD:-}" != "1" ]; then
+  if "$install_dir/jcode" server reload </dev/null >/dev/null 2>&1; then
+    echo "Reloaded the running jcode server onto $hash (if one was active)."
+  fi
+fi
+
+if ! echo "$PATH" | tr ':' '\n' | grep -qx "$install_dir"; then
+  echo ""
+  echo "Tip: add $install_dir to PATH if needed."
+fi
+
+# Ensure the launcher dir is on PATH for bash, zsh and fish in future shells.
+# shellcheck source=scripts/lib/configure_path.sh
+. "$(dirname "$0")/lib/configure_path.sh"
+jcode_configure_path "$install_dir"