@

feat(summarization): 非破坏性上下文压缩——保留原始对话仅在请求时瞬态压缩

重写 DeerFlowSummarizationMiddleware：将 stock before_model 的
RemoveMessage(REMOVE_ALL_MESSAGES) 改为 no-op，改在 wrap_model_call 中
瞬态压缩为 [summary, *recent]，完整原始对话仍保留在 state 中，前端继续
渲染用户真实问答。summary 消息标记 hide_from_ui 且永不持久化，按 thread
缓存以避免每次模型调用都触发 LLM。前端 isHiddenFromUIMessage 额外隐藏旧
版本持久化的 name="summary" 消息。

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
@

frontend-web/src/core/messages/utils.ts

@@ -434,7 +434,17 @@ export function findToolCallResult(
 }
 
 export function isHiddenFromUIMessage(message: Message) {
-  return message.additional_kwargs?.hide_from_ui === true;
+  if (message.additional_kwargs?.hide_from_ui === true) {
+    return true;
+  }
+  // Conversation-summary messages are context for the model only — never shown
+  // to the user. New summaries are injected transiently (never persisted), but
+  // threads compacted by older builds still carry a persisted `name: "summary"`
+  // HumanMessage, so hide those too.
+  if (message.name === "summary") {
+    return true;
+  }
+  return false;
 }
 
 /**