#13 task list executor function fix

internal/listexecutor/listexecutor.go

@@ -123,7 +123,7 @@ func (l *ListExecutor) Execute(ctx context.Context, list *tasklist.TaskList) {
 	list.StartTime = time.Now()
 
 	// execute groups sequentially
-	for i, _ := range list.Groups {
+	for i := range list.Groups {
 		if err := l.executeGroup(ctx, &list.Groups[i]); err != nil {
 			logger.Error("error executing group", zap.Error(err))
 			list.Groups[i].State = taskpkg.Failed