chore: import upstream snapshot with attribution

tests/test_extract_code_only_cli.py

@@ -0,0 +1,55 @@
+"""`graphify extract --code-only` indexes code without an LLM key (#1734).
+
+A mixed repo (code + docs) with no API key configured used to hard-fail on the
+doc/paper/image files. `--code-only` skips the semantic pass so the code graph
+still builds, and the no-key error now points users at the flag.
+"""
+from __future__ import annotations
+
+import os
+import subprocess
+import sys
+from pathlib import Path
+
+PYTHON = sys.executable
+_KEY_VARS = ("GEMINI_API_KEY", "GOOGLE_API_KEY", "OPENAI_API_KEY", "OPENAI_BASE_URL",
+             "ANTHROPIC_API_KEY", "MOONSHOT_API_KEY", "DEEPSEEK_API_KEY")
+
+
+def _mixed_repo(tmp_path: Path) -> Path:
+    repo = tmp_path / "repo"
+    repo.mkdir()
+    (repo / "app.py").write_text("def hello():\n    return 1\n")
+    (repo / "README.md").write_text("# Design\n\nHow it works.\n")
+    (repo / "NOTES.txt").write_text("Architecture notes and rationale.\n")
+    return repo
+
+
+def _run(repo: Path, *extra: str):
+    env = {k: v for k, v in os.environ.items() if k not in _KEY_VARS}
+    env["GRAPHIFY_OUT"] = str(repo / "graphify-out")
+    return subprocess.run(
+        [PYTHON, "-m", "graphify", "extract", ".", *extra],
+        cwd=repo, capture_output=True, text=True, env=env,
+    )
+
+
+def test_code_only_succeeds_without_key(tmp_path):
+    repo = _mixed_repo(tmp_path)
+    r = _run(repo, "--code-only")
+    assert r.returncode == 0, f"--code-only should succeed with no key: {r.stderr}"
+    out = r.stdout + r.stderr
+    assert "--code-only: skipping" in out
+    graph = repo / "graphify-out" / "graph.json"
+    assert graph.exists(), "code graph must still be written"
+    import json
+    g = json.loads(graph.read_text())
+    labels = [n.get("label") for n in g["nodes"]]
+    assert any(str(l).startswith("hello") for l in labels), "code was indexed"
+
+
+def test_mixed_repo_without_key_errors_and_points_at_code_only(tmp_path):
+    repo = _mixed_repo(tmp_path)
+    r = _run(repo)  # no --code-only, no key
+    assert r.returncode != 0, "mixed repo with no key should still error without the flag"
+    assert "--code-only" in r.stderr, "the no-key error must point users at --code-only"