feat(p9): propagate trace id into emitted events + structured relay/gateway logs

Task O.2: ai/calendar/route/ingest emit sites now stamp traceparent + insignia.
correlationId from interaction.traceId ?? currentTraceId() ?? generated (mirroring
message.send; inbox/inbound already carried correlationId). toTraceparent is hex-safe
(UUID used as-is, other ids hashed). OutboxRelay logs a structured relay.publish per
event (eventType/aggregateId/correlationId); MessageGateway logs ws.deliver. Tests:
an event's correlationId equals the active request trace, with a generated fallback.

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

packages/iios-service/src/ai/ai.service.ts

@@ -8,6 +8,7 @@ import {
   InferencePort,
   InferenceResult,
 } from '@insignia/iios-contracts';
+import { currentTraceId, newTraceId, toTraceparent } from '../observability/trace-context';
 import { PrismaService } from '../prisma/prisma.service';
 import { PLATFORM_PORTS } from '../platform/platform-ports';
 import { decideOrThrow } from '../platform/fail-closed';
@@ -222,6 +223,7 @@ export class AiJobService {
   }
 
   private async emit(type: string, scopeId: string, aggregateId: string, data: Record<string, unknown>): Promise<void> {
+    const tid = currentTraceId() ?? newTraceId();
     const event: CloudEvent = {
       specversion: '1.0',
       id: `evt_ai_${aggregateId}_${type.split('.').slice(-2, -1)[0]}`,
@@ -230,7 +232,8 @@ export class AiJobService {
       subject: `ai_artifact/${aggregateId}`,
       time: new Date().toISOString(),
       datacontenttype: 'application/json',
-      insignia: { scopeSnapshotId: scopeId, idempotencyKey: `${type}:${aggregateId}`, dataClass: 'internal' },
+      traceparent: toTraceparent(tid),
+      insignia: { scopeSnapshotId: scopeId, correlationId: tid, idempotencyKey: `${type}:${aggregateId}`, dataClass: 'internal' },
       data,
     };
     await this.prisma.iiosOutboxEvent.create({