Agent identity fields on Issue struct:
- HookBead: reference to current work (0..1 cardinality)
- RoleBead: reference to role definition bead
- AgentState: self-reported state (idle|spawning|running|working|stuck|done|stopped|dead)
- LastActivity: timestamp for heartbeat/timeout detection
- RoleType: agent type (polecat|crew|witness|refinery|mayor|deacon)
- Rig: rig name (empty for town-level agents)
Also adds:
- AgentState type with IsValid() method
- Validation for agent state in Issue.Validate()
- Agent fields included in content hash
This enables the agent-as-bead architecture where agents are tracked
as first-class beads with self-reported state.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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