feat(03-04): implement outbox drain state machine (GREEN)
- runOutboxDrain: drains pending outbox rows, dispatches CalDAV writes
via broker/write.ts, classifies HTTP responses per D-07/D-08
- CONFLICT_STATUS=412 routes to conflict flow: mark failed, re-sync (D-08)
- TRANSIENT_STATUSES: exponential backoff with MAX_ATTEMPTS=5 dead-letter (D-07)
- HARD_FAIL_STATUSES 400/401/403: fail immediately, no retry (D-07)
- Edit-as-move D-04: create row sorted before delete for same groupId;
create-fail aborts the paired delete (T-03-14)
- triggerTargetedResync: fetches fresh DAVCalendars, calls syncCalendar (D-06)
- startOutboxWorker: node-cron */15 * * * * * schedule (15s interval)
- Fix test scaffold: vi.hoisted() for mock variables to resolve vitest
hoisting TDZ issue; simplified mock chain to match and() single .where()
Lucas Berger
cd4a8931e5