fix(cli): avoid voice TTS restart race

tests/tools/test_voice_cli_integration.py

@@ -1040,6 +1040,25 @@ class TestDisableVoiceModeReal:
 class TestVoiceSpeakResponseReal:
     """Tests _voice_speak_response with real CLI instance."""
 
+    def test_async_scheduling_clears_done_before_thread_start(self):
+        cli = _make_voice_cli(_voice_tts=True)
+        starts = []
+
+        class FakeThread:
+            def __init__(self, target=None, args=(), daemon=None):
+                self.target = target
+                self.args = args
+                self.daemon = daemon
+
+            def start(self):
+                starts.append(cli._voice_tts_done.is_set())
+
+        with patch("cli.threading.Thread", FakeThread):
+            cli._voice_speak_response_async("Hello")
+
+        assert starts == [False]
+        assert not cli._voice_tts_done.is_set()
+
     @patch("cli._cprint")
     def test_early_return_when_tts_off(self, _cp):
         cli = _make_voice_cli(_voice_tts=False)