fix(retry): avoid CPU busy wait

src/lib/rateLimit.ts

@@ -169,20 +169,8 @@ export async function checkRateLimit(
  * @param seconds - Number of seconds to delay
  * @returns Promise that resolves after the specified delay
  */
-export async function delayRequest(seconds: number): Promise<void> {
-  return new Promise((resolve) => {
-    // Use a simple delay implementation for Workers environment
-    const start = Date.now();
-    const checkTime = () => {
-      if (Date.now() - start >= seconds * 1000) {
-        resolve();
-      } else {
-        // Use minimal delay to prevent blocking
-        Promise.resolve().then(checkTime);
-      }
-    };
-    checkTime();
-  });
+export function delayRequest(seconds: number): Promise<void> {
+  return new Promise((resolve) => setTimeout(resolve, seconds * 1000));
 }
 
 /**

tests/lib/rateLimit.test.ts

@@ -16,7 +16,7 @@ describe("Rate Limit Module", () => {
   });
 
   afterEach(() => {
-    jest.clearAllMocks();
+    jest.restoreAllMocks();
   });
 
   describe("getClientIP", () => {
@@ -90,10 +90,12 @@ describe("Rate Limit Module", () => {
     });
 
     it("should handle zero delay", async () => {
+      const timer = jest.spyOn(globalThis, "setTimeout");
       const startTime = Date.now();
       await delayRequest(0);
       const endTime = Date.now();
 
+      expect(timer).toHaveBeenCalledTimes(1);
       expect(endTime - startTime).toBeLessThan(50);
     });
   });