Added --exit flag for exit type (COMPLETED, ESCALATED, DEFERRED).
When polecat runs gt done, it now sends mail to Witness with:
- Exit type (COMPLETED, ESCALATED, or DEFERRED)
- Issue ID (if available)
- MR ID (for COMPLETED)
- Branch name
For ESCALATED and DEFERRED, skips MR submission but still notifies
Witness. This enables Witness patrol to see completion in inbox-check
step, verify git state, and close polecat lease.
Paired with spawn notification (gt-r6td) to bracket polecat lifecycle.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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