Update dependencies and models for Zulip integration
- Add Zulip-related dependencies (zulip, zulip-bots, markdownify)
- Extend UserMetadata with ZulipAssociation support
- Add GitStore methods for user feed management
- Update CLI commands module imports
- Comprehensive test coverage for new models
- Documentation updates for bot features
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Co-Authored-By: Claude <noreply@anthropic.com>