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>

packages/shared/src/telemetry/index.ts

@@ -12,6 +12,7 @@ export {
 export type {
   TelemetryConfig,
   TelemetryState,
+  TelemetryEvent,
   TelemetryEventEnvelope,
   TelemetryEventName,
 } from "./types.js";