- Add reusable MessageBody and XMPPMessage structs to xmpp client
- Refactor SendMessage to use shared structs instead of inline definitions
- Add SendDirectMessage method for direct user messaging (type="chat")
- Enhance doctor command with --test-dm flag (enabled by default)
- Add testDirectMessage function that sends test message to admin@localhost
- Update help text, examples, and timing measurements for direct messages
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Co-Authored-By: Claude <noreply@anthropic.com>