feat(p9): iios_audit_link table + audit binding at decision points

Task O.3: IiosAuditLink (traceId/correlationId/scopeId/actorRefId/action/
resourceType/resourceId) + recordAudit() helper (reads the current trace from ALS,
best-effort). Written at the decision/mutation points — route approve/deny, AI
accept/reject, meeting summarize, outbound send — so the trace appears in DB and a
decision can be replayed / traced across services (mandated iios_audit_link).
Migration audit-link; resetDb truncates it. 2 tests bind approve/accept to a trace.

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

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

@@ -2,6 +2,7 @@ import { BadRequestException, Inject, Injectable, NotFoundException } from '@nes
 import { Prisma, IiosMeetingType, IiosConsentStatus } from '@prisma/client';
 import { CloudEvent, IIOS_EVENTS, IiosPlatformPorts } from '@insignia/iios-contracts';
 import { currentTraceId, newTraceId, toTraceparent } from '../observability/trace-context';
+import { recordAudit } from '../observability/audit';
 import { PrismaService } from '../prisma/prisma.service';
 import { PLATFORM_PORTS } from '../platform/platform-ports';
 import { decideOrThrow } from '../platform/fail-closed';
@@ -351,6 +352,7 @@ export class CalendarService {
     }
 
     await this.emit(IIOS_EVENTS.meetingSummarized, scopeId, meetingId, { meetingId, summaryId: summary.id });
+    await recordAudit(this.prisma, { action: 'meeting.summarized', resourceType: 'meeting', resourceId: meetingId, scopeId });
     return this.getMeeting(meetingId);
   }