Add file-based mutex for sequential TTS playback#219
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Use syscall.Flock on /tmp/tts.lock to serialize audio playback across concurrent tts processes. The API call and download still happen in parallel — only afplay is serialized. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Use syscall.Flock on /tmp/tts.lock to serialize audio playback across concurrent tts processes, so multiple simultaneous tts invocations play sequentially rather than overlapping.
Co-Authored-By: Claude noreply@anthropic.com