Phase 5 of v2 upgrade:
- Add detailed architecture overview with data flow diagram
- Document key components (EventReader, ContextTracker, CostTracker)
- Add guide for adding new panels
- Add guide for adding new hooks
- Include PR checklist and code style guidelines
- List contribution areas (features, improvements, testing, docs)
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>