test(acms): cover ignored directory traversal

features/acms_context_add.feature

@@ -49,6 +49,11 @@ Feature: ACMS context add command with --tag and --policy flags
     When I traverse the directory recursively with ChunkedFileTraverser
     Then the acms traversal should yield only the Python file
 
+  Scenario: ChunkedFileTraverser skips files inside ignored directories
+    Given a temporary directory with a Python file and an ignored __pycache__ file
+    When I traverse the directory recursively with ChunkedFileTraverser
+    Then the acms traversal should yield only the visible Python file
+
   Scenario: ChunkedFileTraverser raises FileNotFoundError for missing path
     When I traverse a non-existent path with ChunkedFileTraverser
     Then an acms FileNotFoundError should be raised

features/steps/acms_context_add_steps.py

@@ -92,6 +92,18 @@ def step_acms_py_and_pyc(context: Context) -> None:
     context.acms_target_path = tmpdir
 
 
+@given("a temporary directory with a Python file and an ignored __pycache__ file")
+def step_acms_py_and_ignored_cache_dir(context: Context) -> None:
+    """Create a temp dir with a visible file and a file under __pycache__."""
+    context.acms_tmpdir = tempfile.mkdtemp()
+    tmpdir = Path(context.acms_tmpdir)
+    (tmpdir / "module.py").write_text("# module\n", encoding="utf-8")
+    cache_dir = tmpdir / "__pycache__"
+    cache_dir.mkdir()
+    (cache_dir / "cached.py").write_text("# ignored cache module\n", encoding="utf-8")
+    context.acms_target_path = tmpdir
+
+
 @when("I traverse the file with ChunkedFileTraverser")
 def step_acms_traverse_file(context: Context) -> None:
     """Traverse a single file with ChunkedFileTraverser."""
@@ -295,6 +307,16 @@ def step_acms_only_py_file(context: Context) -> None:
     )
 
 
+@then("the acms traversal should yield only the visible Python file")
+def step_acms_only_visible_py_file(context: Context) -> None:
+    assert len(context.acms_entries) == 1, (
+        f"Expected 1 visible Python file, got {len(context.acms_entries)}"
+    )
+    assert context.acms_entries[0].path.name == "module.py", (
+        f"Expected module.py, got {context.acms_entries[0].path}"
+    )
+
+
 @then("an acms FileNotFoundError should be raised")
 def step_acms_file_not_found(context: Context) -> None:
     assert isinstance(context.acms_error, FileNotFoundError), (

src/cleveragents/acms/index.py

@@ -676,11 +676,11 @@ class ChunkedFileTraverser:
 # ---------------------------------------------------------------------------
 
 __all__: list[str] = [
+    "DEFAULT_CHUNK_SIZE",
+    "DEFAULT_IGNORE_PATTERNS",
     "ACMSIndex",
     "AcmsIndexEntry",
     "ChunkedFileTraverser",
-    "DEFAULT_CHUNK_SIZE",
-    "DEFAULT_IGNORE_PATTERNS",
     "FileTraversalEngine",
     "FileType",
     "IndexEntry",