How often the owning process stamps a liveness heartbeat for its in-flight runs.
A Running run whose heartbeat is older than this (or NULL with an older StartedAt) is force-failed.
How often this process re-scans for orphaned runs (mid-life, without waiting for a restart).
Tuning for the agent-run watchdog. All durations are in their named units. Defaults are deliberately conservative: the stale threshold is many heartbeat intervals wide, so a momentarily-slow-but-alive process is never mistaken for a dead one.