- Add checkStaleAgents() to detect agents reporting "running" but not updating
- Add markAgentDead() to update agent bead state to "dead"
- Integrate stale agent check into heartbeat cycle
- DeadAgentTimeout set to 15 minutes
This is a safety mechanism for agents that crash without updating their state.
The daemon now marks them as dead so they can be restarted.
Also fixes duplicate AgentFields declaration - now uses beads.go version with
ParseAgentFieldsFromDescription alias in fields.go.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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