fix(test): use toBeCloseTo for floating-point comparison in rate-limiter test

- Fixes Windows CI failure where utilizationPercent was 19.98 instead of 20
- Floating-point precision differences across platforms require tolerance
- Use toBeCloseTo(20, 1) to allow 1 decimal place tolerance

Author: nipunaudemy

src/utils/__tests__/rate-limiter.test.ts

@@ -112,7 +112,7 @@ describe('RateLimiter', () => {
             expect(status.available).toBe(8);
             expect(status.capacity).toBe(10);
             expect(status.queueSize).toBe(0);
-            expect(status.utilizationPercent).toBe(20);
+            expect(status.utilizationPercent).toBeCloseTo(20, 1);
         });
 
         it('should calculate utilization percentage correctly', () => {