P2-36: Multiple subsystems were string-coupled via the magic
'[Heartbeat]' prefix. Introduce src/main/orchestration/heartbeat-task.ts
as the single source of truth and replace scattered literals in
heartbeat dispatch, automation actions, and run completion.
P3-52: Collapse 5-deep ternary in automation-actions' wake-trigger
selection into lookup helpers (deriveHeartbeatWakeTrigger,
deriveEscalationWakeTrigger).
ZacharyZhang-NY