[JUNE 25] Permanent failover to Flash model for OAuth users after persistent 429 errors (#1376)

Co-authored-by: Scott Densmore <scottdensmore@mac.com>

packages/core/test-setup.ts

@@ -0,0 +1,10 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import { setSimulate429 } from './src/utils/testUtils.js';
+
+// Disable 429 simulation globally for all tests
+setSimulate429(false);