Add speakers segment insight for meeting participant detection
New segment-level insight that analyzes audio + screen context to:
- Detect active video meetings (Zoom, Teams, Meet, etc.)
- Extract participant names from visible UI and conversation
- Handle audio-only imports via conversation pattern detection
- Support segments spanning two distinct meetings
Output structured for occurrence extraction with participant lists.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>