Fix cargo fmt formatting and diarize threading test mock

python/tests/test_diarize.py

@@ -49,8 +49,9 @@ def test_diarize_threading_progress(monkeypatch):
     # Mock pipeline that takes ~5 seconds
     def slow_pipeline(file_path, **kwargs):
         time.sleep(5)
-        # Return a mock diarization result
-        mock_result = MagicMock()
+        # Return a mock diarization result (use spec=object to prevent
+        # hasattr returning True for speaker_diarization)
+        mock_result = MagicMock(spec=[])
         mock_track = MagicMock()
         mock_track.start = 0.0
         mock_track.end = 5.0