- Import scheduleOutboxDrain (not yet exported — causes RED)
- Import signalOutboxDrain from outboxTrigger.ts
- Add describe block 'scheduleOutboxDrain — trigger wiring (D-09)' with 3 tests:
Test A SC-1: signalOutboxDrain() fires drain promptly without timer advance
Test B D-05: two mid-drain signals collapse to exactly one trailing re-drain
Test C D-07: concurrent scheduleOutboxDrain() calls dispatch exactly once via isDraining guard
- 27 pre-existing tests unmodified and passing; 3 new tests failing (RED)
Lucas Berger
bcde073729