Previously, UpdateAgentState embedded hook_bead in the description
text field, while bd slot commands read/write from the SQLite
hook_bead column. This caused gt sling to report hooks as occupied
when bd slot show showed them empty.
Fix: Change UpdateAgentState to use proper bd commands:
- `bd agent state` for agent_state (updates column directly)
- `bd slot set/clear` for hook_bead (updates column directly)
This ensures consistency between gastown and beads commands.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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