Three related fixes:
1. lifecycle.go: Use gt mail delete instead of gt mail read to prevent
lifecycle requests from accumulating.
2. handoff.go: Return exec claude command for respawn-pane instead of
gt crew at which tries to attach to existing session.
3. handoff.md skill: Work without --cycle and -m flags, send mail separately.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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