Detect click/pop discontinuities with bounded PCM evidence

[9o6]

Closes #4

Summary

• add a deterministic PCM16 adjacent-sample discontinuity detector across chunk boundaries
• preserve stage media time separately from wall-clock event time and deduplicate adjacent detections
• project bounded incidents with optional nearby queue-clear/barge-in evidence and an explicit remote playout boundary
• document the detector contract, thresholds, silence handling, and proof limitations

Testing

• python3 -m ruff check src/voxbench/observability/observer.py src/voxbench/observability/__init__.py src/voxbench/control_plane/run_api.py tests/test_observability.py
• python3 -m pytest -q (330 passed, 4 skipped)

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