- Add HeartbeatTriggerScheduler class with timer, assignment, and on-demand trigger types
- Wire timer-based periodic wakeups using per-agent heartbeatIntervalMs config
- Add agent:assigned event in AgentStore for assignment-triggered wakeups
- Enhance POST /api/agents/:id/runs with WakeContext and 409 conflict on concurrent runs
- Integrate trigger scheduler into InProcessRuntime lifecycle (start/stop)
- Add enabled field to AgentHeartbeatConfig for per-agent trigger control
- Update AGENTS.md with heartbeat trigger scheduling documentation
06fe36a64c