Add four new commands for managing the Mayor tmux session:
- gt mayor start - Start the Mayor session
- gt mayor attach - Attach to running session
- gt mayor stop - Stop the session
- gt mayor status - Check if session is running
This allows full replacement of PGT's town mayor commands.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Steve Yegge