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/tsconfig.json

@@ -7,5 +7,5 @@
     "types": ["node"]
   },
   "include": ["src/**/*.ts"],
-  "exclude": ["node_modules", "dist", "src/**/*.spec.ts", "src/**/*.test.ts"]
+  "exclude": ["node_modules", "dist", "src/**/*.spec.ts", "src/**/*.test.ts", "src/test-utils/**"]
 }