Add the mission-tick Payload bin (external cron): sweeps missions
whose status is Scheduled/Active and whose scheduled calendar day
(classification.startDateTime, server-local) has fully passed and
sets them to Completed, emitting a mission:auto-complete event per
mission. Draft and terminal statuses are never touched; idempotent.
Notifies clients via the game-tick SSE path.
Logic lives in src/lib/intelligence/missionLifecycle.ts with an
integration test in tests/int/mission-lifecycle.int.spec.ts.
