task: init RAG once

src/tools/design_retriever.py

@@ -2,15 +2,16 @@ from nodes.design_rag import DesignRAG
 from langgraph.graph import MessagesState
 from langchain_core.messages import SystemMessage
 
+# this should be done at app level is used elsewhere
+rag = DesignRAG()
+
 async def design_retriever_tool(state: MessagesState, num_examples: int = 1):
     """
         Retrieves similar designs based on style requirements
         Name: query_similar_designs
     """
-    rag = DesignRAG()  # Create instance
     
     result = await rag.query_similar_designs(state["messages"], num_examples)
-    print("Here's the result: ", result)
 
     return SystemMessage(content=result)