Restrict Cypress uncaught exception suppression to known benign errors

Co-Authored-By: Codex <codex@openai.com>

tests/unit/cypress/uncaughtExceptionPolicy.test.js

@@ -0,0 +1,31 @@
+import { describe, expect, it } from "vitest";
+import {
+  getCypressUncaughtExceptionDecision,
+  shouldIgnoreUncaughtException,
+} from "../../../cypress/support/uncaughtExceptionPolicy";
+
+describe("shouldIgnoreUncaughtException", () => {
+  it("returns true for known benign ResizeObserver errors", () => {
+    expect(
+      shouldIgnoreUncaughtException(new Error("ResizeObserver loop limit exceeded")),
+    ).toBe(true);
+  });
+
+  it("returns false for unknown runtime errors", () => {
+    expect(shouldIgnoreUncaughtException(new Error("TypeError: x is undefined"))).toBe(false);
+  });
+
+  it("returns false for Cypress handler when the error should be ignored", () => {
+    expect(
+      getCypressUncaughtExceptionDecision(
+        new Error("ResizeObserver loop completed with undelivered notifications."),
+      ),
+    ).toBe(false);
+  });
+
+  it("returns undefined for Cypress handler when the error should fail the test", () => {
+    expect(
+      getCypressUncaughtExceptionDecision(new Error("TypeError: x is undefined")),
+    ).toBeUndefined();
+  });
+});