0xbyt4 eb79dda04b fix: persistent audio stream and silence detection improvements ...

- Keep InputStream alive across recordings to avoid CoreAudio hang on
  repeated open/close cycles on macOS.  New _ensure_stream() creates the
  stream once; start()/stop()/cancel() only toggle frame collection.
- Add _close_stream_with_timeout() with daemon thread to prevent
  stream.stop()/close() from blocking indefinitely.
- Add generation counter to detect stale stream-open completions after
  cancel or restart.
- Run recorder.cancel() in background thread from Ctrl+C handler to
  keep the event loop responsive.
- Add shutdown() method called on /voice off to release audio resources.
- Fix silence timer reset during active speech: use dip tolerance for
  _resume_start tracker so natural speech pauses (< 0.3s) don't prevent
  the silence timer from being reset.
- Update tests to match persistent stream behavior.

2026-03-14 14:27:20 +03:00

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