Fix: Remove workflow/nodes from pyright exclusion (#26461)

Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>

api/core/workflow/nodes/llm/file_saver.py

@@ -46,7 +46,7 @@ class LLMFileSaver(tp.Protocol):
             dot (`.`). For example, `.py` and `.tar.gz` are both valid values, while `py`
             and `tar.gz` are not.
         """
-        pass
+        raise NotImplementedError()
 
     def save_remote_url(self, url: str, file_type: FileType) -> File:
         """save_remote_url saves the file from a remote url returned by LLM.
@@ -56,7 +56,7 @@ class LLMFileSaver(tp.Protocol):
         :param url: the url of the file.
         :param file_type: the file type of the file, check `FileType` enum for reference.
         """
-        pass
+        raise NotImplementedError()
 
 
 EngineFactory: tp.TypeAlias = tp.Callable[[], Engine]

api/core/workflow/nodes/llm/node.py

@@ -128,7 +128,7 @@ class LLMNode(Node):
             graph_runtime_state=graph_runtime_state,
         )
         # LLM file outputs, used for MultiModal outputs.
-        self._file_outputs: list[File] = []
+        self._file_outputs = []
 
         if llm_file_saver is None:
             llm_file_saver = FileSaverImpl(
@@ -166,6 +166,7 @@ class LLMNode(Node):
         node_inputs: dict[str, Any] = {}
         process_data: dict[str, Any] = {}
         result_text = ""
+        clean_text = ""
         usage = LLMUsage.empty_usage()
         finish_reason = None
         reasoning_content = None