fix: respect prune rules for symlink aliases

Author: HarperZ9

src/index_graph/scan.py

@@ -52,6 +52,8 @@ def _onerror(exc: OSError) -> None:
         if ".git" in dirnames or ".git" in filenames:
             repos.add(current)
         for dirname in dirnames:
+            if dirname in prune:
+                continue
             child = current / dirname
             try:
                 if child.is_symlink() and ((child / ".git").is_dir() or (child / ".git").is_file()):

tests/test_scan.py

@@ -69,6 +69,17 @@ def test_discover_reports_sole_directory_symlink_alias(tmp_path: Path):
     assert discover_repos(alias.parent, Config()) == [alias]
 
 
+def test_discover_prunes_directory_symlink_repo_alias(tmp_path: Path):
+    if os.name == "nt":
+        pytest.skip("directory symlink behavior covered on POSIX; Windows uses junction fixture")
+    target = tmp_path / "outside" / "target"
+    _make_repo(target)
+    alias = tmp_path / "scan-root" / "node_modules"
+    alias.parent.mkdir()
+    alias.symlink_to(target, target_is_directory=True)
+    assert discover_repos(alias.parent, Config()) == []
+
+
 def test_deduplicate_repo_aliases_collapses_mocked_physical_identity(
     tmp_path: Path, monkeypatch
 ):