fix handling of SuspendExecutionException in ChildContextOperation

Author: zhongkechen

sdk/src/main/java/com/amazonaws/lambda/durable/operation/ChildContextOperation.java

@@ -161,6 +161,10 @@ private void checkpointSuccess(T result) {
 
     private void handleChildContextFailure(Throwable exception) {
         exception = ExceptionHelper.unwrapCompletableFuture(exception);
+        if (exception instanceof SuspendExecutionException) {
+            // Rethrow Error immediately — do not checkpoint
+            ExceptionHelper.sneakyThrow(exception);
+        }
         if (exception instanceof UnrecoverableDurableExecutionException) {
             terminateExecution((UnrecoverableDurableExecutionException) exception);
         }