feat(service): P3.2 InboxProjector + message.read event + scheduled relay

Event-driven projector creates/collapses NEEDS_REPLY items from message.sent
(traceId propagated; inbox.item.created emitted) and resolves them to DONE on
message.read; idempotent via processed-event ledger. markRead now emits a
message.read outbox event (atomic). OutboxRelay runs on a 500ms timer in the
app (off in tests). Shared resetDb (TRUNCATE CASCADE) fixes cross-spec FK
isolation. 32 tests green.

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

packages/iios-service/src/app.module.ts

@@ -6,11 +6,21 @@ import { InteractionsModule } from './interactions/interactions.module';
 import { OutboxModule } from './outbox/outbox.module';
 import { ThreadsModule } from './threads/threads.module';
 import { MessageModule } from './messaging/message.module';
+import { InboxModule } from './inbox/inbox.module';
 import { HealthController } from './health.controller';
 import { DevController } from './dev/dev.controller';
 
 @Module({
-  imports: [PrismaModule, PlatformModule, IdentityModule, InteractionsModule, OutboxModule, ThreadsModule, MessageModule],
+  imports: [
+    PrismaModule,
+    PlatformModule,
+    IdentityModule,
+    InteractionsModule,
+    OutboxModule,
+    ThreadsModule,
+    MessageModule,
+    InboxModule,
+  ],
   controllers: [HealthController, DevController],
 })
 export class AppModule {}