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/routing/route.spec.ts

@@ -1,6 +1,7 @@
 import { randomUUID } from 'node:crypto';
 import { describe, it, expect, beforeAll, afterAll, beforeEach } from 'vitest';
 import { PrismaClient, IiosRouteMode } from '@prisma/client';
+import { DlqService } from '../outbox/dlq.service';
 import { resetDb } from '../test-utils/reset-db';
 import { makeFakePorts } from '@insignia/iios-testkit';
 import { MessageService, type MessagePrincipal } from '../messaging/message.service';
@@ -159,7 +160,7 @@ describe('RouteService approve/deny → execute (P6)', () => {
 
 describe('RouteProjector — AUTOMATIC forwarding (P6)', () => {
   const routeSvc = () => new RouteService(asService, new RouteSimulator(asService, new RuleEngine()), new OutboundService(asService, new CapabilityBroker(makeFakePorts(), new CapabilityProviderRegistry())), actors);
-  const projector = () => new RouteProjector(asService, new OutboxBus(), routeSvc());
+  const projector = () => new RouteProjector(asService, new OutboxBus(), new DlqService(asService), routeSvc());
 
   // Ingest an inbound (channel-bearing) interaction — routable, unlike native DMs.
   async function ingestInbound(text: string): Promise<{ interactionId: string; scopeId: string; event: CloudEvent }> {