- Implement proper SendMessage function with XML encoding and timeout protection
- Add message sending to MUC test workflow in doctor command
- Test results: join (16.87ms) → send message (75.46µs) → wait (5s) → leave (111.58µs)
- Enhanced doctor logging shows actual message content and comprehensive timing
- Validates complete bidirectional XMPP bridge functionality for production use
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Co-Authored-By: Claude <noreply@anthropic.com>