fix(09): WR-03/IN-03/IN-04 add drain-listener teardown, test-only __resetDrainState, and remove stale RED @ts-ignore

apps/api/src/broker/outboxWorker.ts

@@ -873,6 +873,18 @@ export function stopOutboxTrigger(): void {
   unsubscribeDrain = null;
 }
 
+/**
+ * IN-03: test-only reset for the module-level concurrency flags.
+ * isDraining/drainRequested are the entire concurrency contract for the
+ * single-process deployment and are NOT touched by vi.resetAllMocks(). Tests call
+ * this in beforeEach so each test starts from a known-quiescent state instead of
+ * relying on the previous test having drained cleanly. Not for production use.
+ */
+export function __resetDrainState(): void {
+  isDraining = false;
+  drainRequested = false;
+}
+
 /**
  * Starts the 15-second background outbox drain schedule (polling fallback, D-08).
  * Call once at API startup (wired in index.ts beside startBrokerPoller).