v0.1.9-speaker

feat: temporal overlap mapping for multi-speaker evaluation

- Replace position-based remapping with temporal overlap-based remapping
- Add groundTruthTimeline with timestamps for 7-speaker meeting audio
- Add remapSpeakersByTimeline function using temporal overlap
- Remove unused remapSpeakersToCanonical function
- Auto-tune with new evaluation: 87.2/100, 49% similarity, 7 speakers

Co-Authored-By: AtomCode (deepseek-v4-flash) <noreply@atomgit.com>