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/adapters/outbound.service.ts

@@ -3,6 +3,7 @@ import { Injectable } from '@nestjs/common';
 import { Prisma } from '@prisma/client';
 import { PrismaService } from '../prisma/prisma.service';
 import { CapabilityBroker } from '../capability/capability.broker';
+import { recordAudit } from '../observability/audit';
 
 /**
  * Outbound command layer (P5). Owns idempotency + per-(channelType,target) rate
@@ -69,6 +70,7 @@ export class OutboundService {
         data: { commandId: cmd.id, attemptNo: 1, status: result.outcome, providerRef: result.providerRef, latencyMs: result.latencyMs, errorCode: result.errorCode },
       }),
     ]);
+    await recordAudit(this.prisma, { action: 'channel.send', resourceType: 'outbound_command', resourceId: cmd.id, scopeId });
     return updated;
   }