feat(core-testing): add RecordingRateLimit for test assertions

Captures consume + reset call arguments verbatim via consumeCalls and
resetCalls accessors. Uses local IRateLimit type alias (no core-shared
dep) following the recording-job-queue pattern.

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

packages/core-testing/src/index.ts

@@ -1,3 +1,4 @@
 export * from "./factory/index.js";
 export * from "./contract/index.js";
 export * from "./instrumentation/index.js";
+export * from "./rate-limit/index.js";