test: set returncode on fake Popen proc (main's player loop reads returncode, not wait())

tests/tools/test_transcription_tools.py

@@ -2465,7 +2465,8 @@ class TestCafConversion:
 
         assert result["success"] is True
         mock_convert.assert_not_called()
-=======
+
+
 class TestTranscribeCredentialReadGuard:
     """transcribe_audio must refuse credential/secret stores before dispatch."""
 

tests/tools/test_voice_mode_playback_env_scrub.py

@@ -16,6 +16,7 @@ def test_play_audio_file_scrubbed_env(tmp_path, monkeypatch):
         captured["env"] = kwargs.get("env")
         proc = MagicMock()
         proc.wait.return_value = 0
+        proc.returncode = 0
         return proc
 
     import tools.voice_mode as vm