c7ee891a90
- Add FlowUtteranceEndCoordinator with 350ms silence drain and 150ms post-roll - Extend FinalChunkRecovery for short/empty final chunks in chunked pipeline - Snapshot partial at mic stop and guard final transcript in FlowSessionManager - Unify tail drain presets (iosFlow/macMLX) and expand diagnostics Co-authored-by: Rocky <hkgood@users.noreply.github.com>