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/adapters/adapters.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, type CloudEvent } from '@insignia/iios-contracts';
@@ -23,7 +24,7 @@ const SECRET = 'dev-adapter-secret'; // AdapterRegistry default
 const registry = () => new AdapterRegistry();
 const inbound = () => new InboundService(asService, registry());
 const projector = () =>
-  new RawEventProjector(asService, new OutboxBus(), registry(), new IngestService(asService, makeFakePorts(), new ActorResolver(asService)));
+  new RawEventProjector(asService, new OutboxBus(), new DlqService(asService), registry(), new IngestService(asService, makeFakePorts(), new ActorResolver(asService)));
 
 async function rawReceivedEvents(): Promise<CloudEvent[]> {
   const rows = await prisma.iiosOutboxEvent.findMany({ where: { eventType: IIOS_EVENTS.rawReceived }, orderBy: { createdAt: 'asc' } });

packages/iios-service/src/adapters/raw-event.projector.ts

@@ -2,6 +2,7 @@ import { Injectable, OnModuleInit } from '@nestjs/common';
 import { CloudEvent, IIOS_EVENTS } from '@insignia/iios-contracts';
 import { PrismaService } from '../prisma/prisma.service';
 import { OutboxBus } from '../outbox/outbox.bus';
+import { DlqService } from '../outbox/dlq.service';
 import { AdapterRegistry } from './adapter.registry';
 import { IngestService } from '../interactions/ingest.service';
 
@@ -17,12 +18,14 @@ export class RawEventProjector implements OnModuleInit {
   constructor(
     private readonly prisma: PrismaService,
     private readonly bus: OutboxBus,
+    private readonly dlq: DlqService,
     private readonly registry: AdapterRegistry,
     private readonly ingest: IngestService,
   ) {}
 
   onModuleInit(): void {
-    this.bus.on(IIOS_EVENTS.rawReceived, (p) => void this.onRawReceived(p as CloudEvent).catch(() => {}));
+    this.dlq.registerHandler(this.consumer, (e) => this.onRawReceived(e));
+    this.bus.on(IIOS_EVENTS.rawReceived, (p) => void this.onRawReceived(p as CloudEvent).catch((err) => this.dlq.onConsumerFailure(this.consumer, p as CloudEvent, err)));
   }
 
   async onRawReceived(event: CloudEvent): Promise<void> {