feat(mma): Integrate AST skeleton extraction into Tier 3 context build

tests/test_tiered_context.py

@@ -24,13 +24,45 @@ def test_build_tier2_context_exists():
     result = build_tier2_context(file_items, Path("."), [], history)
     assert "Other content" in result
 
+def test_build_tier3_context_ast_skeleton(monkeypatch):
+    from unittest.mock import MagicMock
+    import aggregate
+    import file_cache
+    
+    # Mock ASTParser
+    mock_parser_instance = MagicMock()
+    mock_parser_instance.get_skeleton.return_value = "def other():\n    ..."
+    mock_parser_class = MagicMock(return_value=mock_parser_instance)
+    
+    # Mock file_cache.ASTParser in aggregate module
+    monkeypatch.setattr("aggregate.ASTParser", mock_parser_class)
+    
+    file_items = [
+        {"path": Path("other.py"), "entry": "other.py", "content": "def other():\n    pass", "error": False}
+    ]
+    history = []
+    
+    # New behavior check: it should use ASTParser for .py files not in focus
+    result = build_tier3_context(file_items, Path("."), [], history, focus_files=[])
+    
+    assert "def other():" in result
+    assert "..." in result
+    assert "Python" not in result # summarize.py output should not be there if AST skeleton is used
+    mock_parser_class.assert_called_once_with("python")
+    mock_parser_instance.get_skeleton.assert_called_once_with("def other():\n    pass")
+
 def test_build_tier3_context_exists():
     file_items = [
-        {"path": Path("focus.py"), "entry": "focus.py", "content": "Focus content", "error": False},
-        {"path": Path("other.py"), "entry": "other.py", "content": "Other content", "error": False}
+        {"path": Path("focus.py"), "entry": "focus.py", "content": "def focus():\n    pass", "error": False},
+        {"path": Path("other.py"), "entry": "other.py", "content": "def other():\n    pass", "error": False}
     ]
     history = ["User: hello"]
     result = build_tier3_context(file_items, Path("."), [], history, focus_files=["focus.py"])
     
-    assert "Focus content" in result
-    assert "Other content" not in result
+    assert "def focus():" in result
+    assert "pass" in result
+    # other.py should have skeletonized content, not full "pass" (if get_skeleton works)
+    # However, for a simple "pass", the skeleton might be the same or similar.
+    # Let's check for the header
+    assert "other.py" in result
+    assert "AST Skeleton" in result