fix: align telemetry client payload and dimensions with backend schema

Restructure the TelemetryClient to send the correct backend envelope
format ({app, schemaVersion, installId, events: [{name, occurredAt, dimensions}]})
instead of the old per-event format. Update all event dimension names
to match the backend registry (agent_role, adapter_type, error_code, etc.).

Co-Authored-By: Paperclip <noreply@paperclip.ing>

server/src/routes/issues.ts

@@ -1184,7 +1184,7 @@ export function issueRoutes(db: Db, storage: StorageService) {
       if (tc && actor.agentId) {
         const actorAgent = await agentsSvc.getById(actor.agentId);
         if (actorAgent) {
-          trackAgentTaskCompleted(tc, { adapterType: actorAgent.adapterType });
+          trackAgentTaskCompleted(tc, { agentRole: actorAgent.adapterType });
         }
       }
     }