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

backend/tests/test_executor_vfs.py

@@ -0,0 +1,36 @@
+from ea_chatbot.graph.nodes.executor import executor_node
+from ea_chatbot.graph.state import AgentState
+
+def test_executor_with_vfs():
+    """Verify that the executor node provides VFS access to the code."""
+    state = AgentState(
+        messages=[],
+        question="test",
+        analysis={},
+        next_action="test",
+        iterations=0,
+        checklist=[],
+        current_step=0,
+        vfs={},
+        plots=[],
+        dfs={}
+    )
+    
+    # Code that uses the 'vfs' helper
+    code = """
+vfs.write("output.txt", "Execution Result", metadata={"type": "text"})
+print("VFS Write Complete")
+"""
+    state["code"] = code
+    
+    result = executor_node(state)
+    
+    # Check if the execution was successful
+    assert result["error"] is None
+    assert "VFS Write Complete" in result["code_output"]
+    
+    # Verify that the VFS state was updated
+    # Note: executor_node returns a dict of updates, which should include the updated 'vfs'
+    assert "vfs" in result
+    assert "output.txt" in result["vfs"]
+    assert result["vfs"]["output.txt"]["content"] == "Execution Result"