Previously, when gt done was called, it cleared the agent's hook_bead
slot but didn't update the status of the hooked bead itself. This left
handoff beads with status=hooked forever.
Now the hooked bead is closed (status changed from hooked to closed)
before clearing the agent's hook slot.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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