feat(executor): Integrate VFS helper for in-memory artifact tracking

backend/src/ea_chatbot/graph/nodes/executor.py

@@ -8,6 +8,7 @@ from matplotlib.figure import Figure
 
 from ea_chatbot.graph.state import AgentState
 from ea_chatbot.utils.db_client import DBClient
+from ea_chatbot.utils.vfs import VFSHelper
 from ea_chatbot.utils.logging import get_logger
 from ea_chatbot.config import Settings
 
@@ -37,12 +38,17 @@ def executor_node(state: AgentState) -> dict:
     
     db_client = DBClient(settings=db_settings)
     
+    # Initialize the Virtual File System (VFS) helper
+    vfs_state = dict(state.get("vfs", {}))
+    vfs_helper = VFSHelper(vfs_state)
+
     # Initialize local variables for execution
     # 'db' is the DBClient instance, 'plots' is for matplotlib figures
     local_vars = {
         'db': db_client,
         'plots': [],
-        'pd': pd
+        'pd': pd,
+        'vfs': vfs_helper
     }
     
     stdout_buffer = io.StringIO()
@@ -98,5 +104,6 @@ def executor_node(state: AgentState) -> dict:
         "code_output": code_output,
         "error": error,
         "plots": plots,
-        "dfs": dfs
+        "dfs": dfs,
+        "vfs": vfs_state
     }