- Add XEPFeatures framework for managing XMPP extension protocols
- Implement complete XEP-0077 In-Band Registration functionality
- Add server capability detection using disco#info queries
- Only initialize XEP features when server supports them
- Add comprehensive XEP-0077 testing to doctor command
- Doctor tests create and delete test users to validate functionality
- Add struct-based XEP management instead of dynamic maps
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
