feat: preserve isolated visitor agent runtime

app/service/agent/base.py

@@ -129,11 +129,16 @@ class BaseAgent(ABC):
     async def recall_memory(self, request: AgentRequest, context: RequestContext) -> None:
         if self._governance is None:
             raise RecoverableAgentError("缺少记忆治理依赖")
+        if "visitor" in context.roles:
+            self.memories = ()
+            return
         self.memories = await self._governance.recall(context)
         if any(memory.customer_id != context.user_id for memory in self.memories):
             raise RecoverableAgentError("记忆召回越过客户范围")
 
     async def classify_intent(self, request: AgentRequest) -> IntentResult | None:
+        if not self.definition.requires_model_intent_classification:
+            return None
         if self._intent_classifier is None or self._intent_endpoint_resolver is None:
             return None
         endpoints = await self._intent_endpoint_resolver.resolve(