Keep reference manifests parser-free

tests/test_python_reference_adapter.py

@@ -5,7 +5,9 @@ import tempfile
 import unittest
 from pathlib import Path
 from typing import cast
+from unittest import mock
 
+import docforge.adapters.python as python_adapter
 from docforge.adapter_sdk import (
     AdapterProject,
     AdapterSource,
@@ -137,10 +139,17 @@ class PythonReferenceAdapterTests(unittest.TestCase):
             )
 
             adapter.extracted_paths.clear()
-            warm = index.build()
+            original_parse = python_adapter.ast.parse
+            with mock.patch.object(
+                python_adapter.ast,
+                "parse",
+                wraps=original_parse,
+            ) as parsed:
+                warm = index.build()
             self.assertEqual(4, self.build_metrics(warm)["cache_hits"])
             self.assertEqual(0, self.build_metrics(warm)["reparsed_sources"])
             self.assertEqual([], adapter.extracted_paths)
+            parsed.assert_not_called()
 
             shared = root / "src" / "sample" / "shared.py"
             shared.write_text(
@@ -150,8 +159,14 @@ class PythonReferenceAdapterTests(unittest.TestCase):
                 encoding="utf-8",
             )
             adapter.extracted_paths.clear()
-            changed = index.build()
+            with mock.patch.object(
+                python_adapter.ast,
+                "parse",
+                wraps=original_parse,
+            ) as parsed:
+                changed = index.build()
             self.assertEqual(4, self.build_metrics(changed)["invalidated_sources"])
+            self.assertGreater(parsed.call_count, 0)
             self.assertEqual(
                 [
                     "src/sample/__init__.py",