- Fix _begin_silence pushing same object reference as _end_silence,
causing the consumer to process two ended events and double the
silence duration.
- Fix initial silence never cleared when VAC is disabled, causing
the no-VAC path to enqueue zero audio.
- Add sample-precise silence boundaries (at_sample parameter).
- Add whisperlivekit/metrics.py with WER computation (word-level
Levenshtein) and timestamp accuracy (greedy alignment). No
external dependencies.
- Add whisperlivekit/metrics_collector.py with SessionMetrics
dataclass for per-session runtime observability. Instrumented
at 6 points in AudioProcessor: init, process_audio,
transcription_processor, _end_silence, results_formatter, cleanup.
Emits SESSION_METRICS structured log line on session end.
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