Fix wiki TypeError on null source_file and skip nested worktrees/ dirs (#1016, #1023)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/test_detect.py

@@ -657,6 +657,19 @@ def test_detect_skips_worktrees_dir(tmp_path):
     assert not any(".worktrees" in f for f in code)
 
 
+def test_detect_skips_nested_worktrees_dir(tmp_path):
+    """Files inside .claude/worktrees/ (nested placement) are never indexed (#1023)."""
+    wt = tmp_path / ".claude" / "worktrees" / "feature-branch"
+    wt.mkdir(parents=True)
+    (wt / "main.py").write_text("x = 1")
+    (tmp_path / "app.py").write_text("y = 2")
+
+    result = detect(tmp_path)
+    code = result["files"]["code"]
+    assert any("app.py" in f for f in code)
+    assert not any("worktrees" in f for f in code)
+
+
 def test_detect_extra_excludes_pattern(tmp_path):
     """extra_excludes patterns exclude matching files from detect() (#947)."""
     (tmp_path / "main.py").write_text("x = 1")

tests/test_wiki.py

@@ -197,3 +197,16 @@ def test_to_wiki_stale_nodes_prints_warning(tmp_path, capsys):
     err = capsys.readouterr().err
     assert "2" in err  # dropped count
     assert "stale" in err.lower()
+
+
+def test_community_article_handles_null_source_file(tmp_path):
+    """source_file=None on a node must not crash sorted() with TypeError (#1016)."""
+    G = nx.Graph()
+    G.add_node("n1", label="parse", file_type="code", source_file=None, community=0)
+    G.add_node("n2", label="validate", file_type="code", source_file="parser.py", community=0)
+    G.add_edge("n1", "n2", relation="calls", confidence="EXTRACTED", weight=1.0)
+    communities = {0: ["n1", "n2"]}
+    labels = {0: "Parsing Layer"}
+    # Must not raise TypeError
+    to_wiki(G, communities, tmp_path, community_labels=labels)
+    assert (tmp_path / "index.md").exists()