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/inbox/inbox.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 } from '@insignia/iios-testkit';
 import { IIOS_EVENTS, PolicyDeniedError, type CloudEvent } from '@insignia/iios-contracts';
@@ -15,7 +16,7 @@ const prisma = new PrismaClient({ datasources: { db: { url } } });
 const asService = prisma as unknown as PrismaService;
 const actors = new ActorResolver(asService);
 const ms = () => new MessageService(asService, makeFakePorts(), actors);
-const projector = () => new InboxProjector(asService, new OutboxBus());
+const projector = () => new InboxProjector(asService, new OutboxBus(), new DlqService(asService));
 
 const alice: MessagePrincipal = { userId: 'alice', orgId: 'org_demo', appId: 'portal-demo', displayName: 'Alice' };
 const bob: MessagePrincipal = { userId: 'bob', orgId: 'org_demo', appId: 'portal-demo', displayName: 'Bob' };