feat(iios): wire projectors + relay into DLQ (P9 chaos-safe)

Projectors register a replay handler and route bus errors to
dlq.onConsumerFailure (dead-letter + clear the claim-then-fail claim)
instead of swallowing them. Relay dead-letters an outbox event after
IIOS_OUTBOX_MAX_ATTEMPTS instead of retrying forever. Chaos test proves
poison → DLQ → replay resolves while sibling events keep flowing (KG-13/KG-06).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

packages/iios-service/src/outbox/replay.spec.ts

@@ -1,5 +1,6 @@
 import { describe, it, expect, beforeAll, afterAll, beforeEach } from 'vitest';
 import { PrismaClient } from '@prisma/client';
+import { DlqService } from '../outbox/dlq.service';
 import { resetDb } from '../test-utils/reset-db';
 import { makeFakePorts, portalMessageBasic, replayTwice, isIdempotent } from '@insignia/iios-testkit';
 import { IngestService } from '../interactions/ingest.service';
@@ -36,7 +37,7 @@ describe('outbox relay + replay', () => {
     const bus = new OutboxBus();
     const received: string[] = [];
     bus.onAny((eventType) => received.push(eventType));
-    const relay = new OutboxRelay(asService, bus);
+    const relay = new OutboxRelay(asService, bus, new DlqService(asService));
 
     await ingest.ingest(portalMessageBasic, portalMessageBasic.providerEventId!);