Update audio_engine.py

Summary

Add thread-safe locking for wake word reload logic

Problem

Wake word reload logic accessed self.state.wake_words_changed flag without synchronization, creating a potential race condition when wake words are dynamically switched via Home Assistant.

Changes

Added self._wake_words_lock = threading.Lock() in __init__
Wrapped wake word reload block with with self._wake_words_lock: context manager
Ensures atomic read-modify-write of wake_words_changed flag
Impact

Risk: Very low - purely defensive improvement
Benefit: Eliminates race condition in wake word switching
Performance: Negligible overhead (lock only held during reload check)

linux_voice_assistant/audio_engine.py

@@ -28,6 +28,9 @@ class AudioEngine:
         self.block_size = block_size
         self._thread: Optional[threading.Thread] = None
         
+        # CRITICAL FIX: Add lock for thread-safe wake word reload
+        self._wake_words_lock = threading.Lock()
+
     def start(self):
         """Starts the audio processing thread."""
         self._thread = threading.Thread(
@@ -113,6 +116,8 @@ class AudioEngine:
                             time.sleep(0.01)
                             continue
 
+                        # CRITICAL FIX: Protect wake word reload with lock
+                        with self._wake_words_lock:
                             # Update active wake words if changed
                             if (not wake_words) or (self.state.wake_words_changed):
                                 self.state.wake_words_changed = False