Implements the agent-side lifecycle request command (gt-gby):
- Detects agent role via GT_ROLE env, tmux session, or directory
- Pre-flight checks (git clean) before retirement
- Sends handoff mail to self for context preservation
- Sends lifecycle request to manager (daemon/ for Mayor/Witness)
- Sets requesting_cycle state and waits for retirement
Usage:
gt handoff # Role-appropriate default
gt handoff --cycle # Restart with handoff mail
gt handoff --restart # Fresh restart
gt handoff --shutdown # Terminate without restart
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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