Minor code cleanup in memory and agent node modules

Refactored list comprehension in token_buffer_memory.py for conciseness and added minor formatting improvements in agent_node.py. No functional changes were made.

api/core/memory/token_buffer_memory.py

@@ -109,9 +109,7 @@ class TokenBufferMemory:
 
             # If attachment filtering is enabled, filter MessageFile list first.
             if allowed_upload_ids is not None:
-                files = [
-                    f for f in files if f.upload_file_id and str(f.upload_file_id) in allowed_upload_ids
-                ]
+                files = [f for f in files if f.upload_file_id and str(f.upload_file_id) in allowed_upload_ids]
 
             if files:
                 file_extra_config = None

api/core/workflow/nodes/agent/agent_node.py

@@ -36,6 +36,7 @@ from extensions.ext_database import db
 from factories.agent_factory import get_plugin_agent_strategy
 from models.model import Conversation, NodeFileUsage
 
+
 class AgentNode(ToolNode):
     """
     Agent Node
@@ -256,6 +257,7 @@ class AgentNode(ToolNode):
                     value = cast(dict[str, Any], value)
                     model_instance, model_schema = self._fetch_model(value)
                     history_prompt_messages: list[dict[str, Any]] = []
+
                     # Check if this agent node references sys.files
                     def _input_uses_sys_files(_agent_input):
                         if _agent_input.type == "variable":