feat(core-testing): add RecordingAnalytics test double

Implements IAnalytics with recorded arrays (tracked, identified,
pageViewed) and flush() that drains the buffer. Mirrors the pattern
established by RecordingAuditLog; inline type aliases avoid a
build-graph cycle with @repo/core-analytics.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

packages/core-testing/src/instrumentation/index.ts

@@ -5,3 +5,9 @@ export { RecordingJobQueue } from "./recording-job-queue";
 export { RecordingEventBus } from "./recording-event-bus";
 export { RecordingRealtimeBroadcaster } from "./recording-realtime-broadcaster";
 export { RecordingAuditLog } from "./recording-audit-log";
+export {
+  RecordingAnalytics,
+  type RecordedTrack,
+  type RecordedIdentify,
+  type RecordedPageView,
+} from "./recording-analytics";