address comments

test/s3/iam/s3_iam_distributed_test.go

@@ -132,7 +132,7 @@ func TestS3IAMDistributedTests(t *testing.T) {
 			var lastErr error
 			for attempt := 0; attempt <= maxRetries; attempt++ {
 				if attempt > 0 {
-					time.Sleep(retryDelay * time.Duration(attempt)) // Exponential backoff
+					time.Sleep(retryDelay * time.Duration(attempt)) // Linear backoff
 				}
 
 				lastErr = operation()

test/s3/iam/s3_iam_framework.go

@@ -390,9 +390,8 @@ func (f *S3IAMTestFramework) generateSTSSessionToken(username, roleName string,
 		return "", err
 	}
 
-	// Note: In a real implementation, we would also create the session in the STS session store
-	// For now, we'll rely on the fact that if JWT validation passes, the session should be considered valid
-	// This is a limitation of our current testing approach
+	// The generated JWT is self-contained and includes all necessary session information.
+	// The stateless design of the STS service means no external session storage is required.
 
 	return tokenString, nil
 }