gt shutdown --graceful sends ESC to all agents, requests handoff,
waits for them to save state (default 30s), then terminates.
Phases:
1. Send ESC to interrupt agents
2. Send shutdown message requesting handoff
3. Wait for agents to complete (configurable with --wait)
4. Kill all sessions in correct order
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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