New package with shared utilities for Matrix bots:
**Components:**
- `BaseMatrixService` - Abstract base class with client lifecycle
- `HealthController` - Standardized health endpoint
- `MatrixMessageService` - Message/reply/reaction helpers
- `markdownToHtml` - Markdown to HTML conversion
- `KeywordCommandDetector` - Natural language command detection
- `SessionHelper<T>` - Type-safe session data wrapper
- `UserListMapper<T>` - Number-based reference system
**Estimated Impact:**
- ~4,000 lines of duplicate code can be eliminated
- 19 Matrix bots can use these shared utilities
- Consistent behavior across all bots
Documentation in packages/matrix-bot-common/CLAUDE.md
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
