f0240c3088
- Accumulate utterance PCM in FlowContinuousCapture for batch retry - Run full-utterance transcribeChunk when stitched final lags partial - Refactor Mac MLX tail drain to shared FlowUtteranceEndCoordinator - Add FlowUtterancePCMStore, UtteranceBatchFallbackPolicy, and tests Co-authored-by: Rocky <hkgood@users.noreply.github.com>