Add enhanced Zulip bot conversation options and configuration
- Add username claiming functionality (@mention claim <username>)
- Add schedule query feature (@mention schedule)
- Add configurable RSS polling parameters
- Add botrc configuration file with defaults for bot behavior
- Add persistent storage for bot settings in Zulip
- Add notification system for config changes and username claims
- Create secure template files for bot configuration
- Update .gitignore to exclude secret configuration files
- Add comprehensive setup documentation
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Co-Authored-By: Claude <noreply@anthropic.com>