Add HookInfo struct and hook discovery to show which agents have work
attached to their hooks. Updates both JSON and text output:
- New HookInfo type with agent, role, has_work, molecule, and title fields
- RigStatus now includes Hooks slice
- StatusSum includes ActiveHooks count
- discoverRigHooks() scans polecats, crew, witness, and refinery
- getAgentHook() retrieves hook status from handoff beads
- Text output shows active hooks per rig with agent and molecule info
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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