feat(billing): implement G1 AI credits overage flow with billing telemetry (#18590)

packages/core/src/telemetry/index.ts

@@ -77,6 +77,7 @@ export type { TelemetryEvent } from './types.js';
 export { SpanStatusCode, ValueType } from '@opentelemetry/api';
 export { SemanticAttributes } from '@opentelemetry/semantic-conventions';
 export * from './uiTelemetry.js';
+export * from './billingEvents.js';
 export {
   MemoryMonitor,
   initializeMemoryMonitor,
@@ -145,6 +146,9 @@ export {
   GenAiOperationName,
   GenAiProviderName,
   GenAiTokenType,
+  // Billing metrics functions
+  recordOverageOptionSelected,
+  recordCreditPurchaseClick,
 } from './metrics.js';
 export { runInDevTraceSpan, type SpanMetadata } from './trace.js';
 export { startupProfiler, StartupProfiler } from './startupProfiler.js';