fix(execution): Reimplemented the redirection logic

src/utils/ast/ast_redir.h

@@ -21,6 +21,7 @@ struct ast_redir
     int io_number; // The FD being redirected (default -1 if not specified,
                    // implies 0 or 1 based on type)
     enum ast_redir_type type;
+    int saved_fd; // To store the original FD for restoration (-1 before save)
 };
 
 bool ast_is_redir(struct ast *node);