fix(orchestrator): Apply refinements from code review

backend/tests/test_review_fix_integration.py

@@ -0,0 +1,42 @@
+import pytest
+from ea_chatbot.graph.workflow import create_workflow, data_analyst_worker_node
+from ea_chatbot.graph.state import AgentState
+from unittest.mock import MagicMock, patch
+from langchain_core.messages import HumanMessage, AIMessage
+
+def test_worker_merge_sets_summary_for_reflector():
+    """Verify that worker node (wrapper) sets the 'summary' field for the Reflector."""
+    
+    state = AgentState(
+        messages=[HumanMessage(content="test")],
+        question="test",
+        checklist=[{"task": "Analyze data", "worker": "data_analyst"}],
+        current_step=0,
+        iterations=0,
+        vfs={},
+        plots=[],
+        dfs={},
+        next_action="",
+        analysis={},
+        summary="Initial Planner Summary" # Stale summary
+    )
+    
+    # Mock the compiled worker subgraph to return a specific result
+    with patch("ea_chatbot.graph.workflow._DATA_ANALYST_WORKER") as mock_worker:
+        mock_worker.invoke.return_value = {
+            "result": "Actual Worker Findings",
+            "messages": [AIMessage(content="Internal")],
+            "vfs_state": {},
+            "plots": []
+        }
+        
+        # Execute the wrapper node
+        updates = data_analyst_worker_node(state)
+        
+        # Verify that 'summary' is in updates and has the worker result
+        assert "summary" in updates
+        assert updates["summary"] == "Actual Worker Findings"
+        
+        # When applied to state, it should overwrite the stale summary
+        state.update(updates)
+        assert state["summary"] == "Actual Worker Findings"