anti 5c0631e12c feat(agent,forwarder,updater): publish system.<worker>.health heartbeats (DEBT-031 workers 7-9) ...

All three workers now share a run_health_heartbeat helper in
decnet.bus.publish.  Each publishes system.<worker>.health on a 30s tick
with {worker, ts} plus optional per-worker extras.  Subscribers can
watch system.*.health to see every DECNET worker on a host at once.

- agent: heartbeat runs inside the FastAPI lifespan alongside the
  existing master-facing heartbeat; bus-disabled path is a no-op.
- forwarder: heartbeat task spawned at run_forwarder entry, cancelled
  in the finally block so a crashed master loop never leaks the task.
- updater: new FastAPI lifespan hosts the heartbeat.

Heartbeat helper swallows extra() failures and is cancellation-safe so
lifespan teardown never hangs on it.

2026-04-21 17:02:10 -04:00

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