- daemon.go: Add SIGUSR1 handler to process lifecycle requests immediately - handoff.go: Signal daemon after sending lifecycle mail to deacon/ - mail.go: Show message IDs in hook output for direct reading Previously, gt handoff would wait up to 5 min for daemon heartbeat poll. Now lifecycle requests are processed within milliseconds. Closes gt-zut3 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>