fix: prevent duplicate state kwargs

Author: heliamoh

src/agent/profiles/base.py

@@ -61,7 +61,9 @@ async def preprocess(self, state: BaseState, config: RunnableConfig) -> BaseStat
             safety=result.get("safety", SAFETY_SAFE),
             reason_unsafe=result.get("reason_unsafe", ""),
         )
-        return BaseState(**state, **mapped_state)
+        merged_state = dict(state)
+        merged_state.update(mapped_state)
+        return BaseState(**merged_state)
 
     async def postprocess(self, state: BaseState, config: RunnableConfig) -> BaseState:
         search_results: list[WebSearchResult] = []