feat(supervisor): Phase 2 metrics ingest — AgentEvent/AgentSession rollup

- New AgentHistoryService: persistAgentEvent pairs START/END for durationS, patchCallTiming updates Call SLA fields
- Supervisor service wires handleCallEvent (CALL_START on Answered, CALL_END on Disconnect) and handleAgentEvent (LOGIN/LOGOUT/PAUSE/RESUME/ACW_START/ACW_END/READY) via priorState-aware mapping
- setInterval-based nightly-ish rollup: every 15min aggregates AgentEvent into AgentSession per IST day (idempotent upsert by agentId+date)
- Ozonetel dispose flow extracts HandlingTime/WrapupDuration/HoldDuration from CDR, patches Call timing fields
- Field names match platform truncation: durationS, loginDurationS, busyTimeS, idleTimeS, pauseTimeS, wrapupTimeS, avgHandlingTimeS, handlingTimeS, acwDurationS, holdDurationS, responseTimeS, sessionDate → date
- Skips cleanly on workspaces where AgentEvent entity isn't synced

Known issue: pending-pair map has single slot per agent, so ACW_START overwrites pending CALL_START and CALL_END computes 0s duration. Fix in followup.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/supervisor/supervisor.module.ts

@@ -4,6 +4,7 @@ import { OzonetelAgentModule } from '../ozonetel/ozonetel-agent.module';
 import { SupervisorController } from './supervisor.controller';
 import { SupervisorBargeController } from './supervisor-barge.controller';
 import { SupervisorService } from './supervisor.service';
+import { AgentHistoryService } from './agent-history.service';
 import { OzonetelAdminAuthService } from '../ozonetel/ozonetel-admin-auth.service';
 
 // Note: TelephonyConfigService is available without import because
@@ -12,7 +13,7 @@ import { OzonetelAdminAuthService } from '../ozonetel/ozonetel-admin-auth.servic
 @Module({
     imports: [PlatformModule, forwardRef(() => OzonetelAgentModule)],
     controllers: [SupervisorController, SupervisorBargeController],
-    providers: [SupervisorService, OzonetelAdminAuthService],
-    exports: [SupervisorService, OzonetelAdminAuthService],
+    providers: [SupervisorService, AgentHistoryService, OzonetelAdminAuthService],
+    exports: [SupervisorService, AgentHistoryService, OzonetelAdminAuthService],
 })
 export class SupervisorModule {}