fix: 协助卡停轮与提交防 409，隐藏配置向导会话，并限制岗位会商产物重复写入

澄清中间件改为 ToolMessage + after_model 停轮，前端提交前取消残留 run；系统/向导 thread_type 从对话列表排除；岗位总结席位加 write_file 上限。

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend-web/src/core/threads/hooks.ts

@@ -28,6 +28,7 @@ import {
   isAbortLikeError,
   isTransientStreamTransportError,
 } from "./thread-access-error";
+import { isHiddenFromRecentChats, shouldHideSystemThreadsFromList } from "./utils";
 
 export type ToolEndEvent = {
   name: string;
@@ -210,6 +211,39 @@ export async function stopThreadRun(
   }
 }
 
+/**
+ * 协助卡提交前：若上一轮还在流式（弱模型出卡后偶发未停干净），先取消服务端 run
+ * 并断开本地 SSE，避免 409「已有活跃 run」或用户点了选项却发不出去。
+ */
+export async function stopActiveThreadBeforeClarificationReply(
+  threadId: string | null | undefined,
+  thread: { isLoading?: boolean; stop: () => void | Promise<void> },
+): Promise<void> {
+  let storedRunId: string | null = null;
+  if (threadId && typeof window !== "undefined") {
+    try {
+      storedRunId = normalizeStoredRunId(
+        window.sessionStorage.getItem(`lg:stream:${threadId}`),
+      );
+    } catch {
+      storedRunId = null;
+    }
+  }
+  if (!thread.isLoading && !storedRunId) return;
+  try {
+    await stopThreadRun(threadId);
+  } catch {
+    /* best-effort */
+  }
+  try {
+    await Promise.resolve(thread.stop());
+  } catch {
+    /* best-effort */
+  }
+  // cancel 落地需要一拍，立刻 submit 仍可能 409。
+  await new Promise((resolve) => setTimeout(resolve, 120));
+}
+
 function getStreamErrorMessage(error: unknown): string {
   if (typeof error === "string" && error.trim()) {
     return error;
@@ -1451,18 +1485,10 @@ export function useThreads(
       }
 
       // Safety net on top of the backend's system-thread exclusion: drop
-      // machine-created threads (scheduled tasks, roundtable workers,
-      // notebooks) in case an older backend still returns them.
-      return threads.filter((t) => {
-        const metadata = t.metadata as Record<string, unknown> | null;
-        if (metadata?.system) return false;
-        const threadType = metadata?.thread_type;
-        return (
-          threadType !== "notebook" &&
-          threadType !== "scheduler" &&
-          threadType !== "roundtable"
-        );
-      });
+      // machine-created / wizard threads (scheduled tasks, report-structure
+      // setup, writing setup, notebooks, …) in case an older backend still
+      // returns them.
+      return threads.filter((t) => !isHiddenFromRecentChats(t));
     },
     refetchOnWindowFocus: false,
   });
@@ -1545,8 +1571,13 @@ export function useThreadsPage(options: {
         throw new Error("Failed to load conversations");
       }
       const rows = (await response.json()) as AgentThread[];
+      // 与后端 exclude_system 对齐：普通列表再兜一层。调用方显式按
+      // thread_type / system 取数（笔记本等）时不滤，避免把目标会话藏掉。
+      const visible = shouldHideSystemThreadsFromList(metadata)
+        ? rows.filter((thread) => !isHiddenFromRecentChats(thread))
+        : rows;
       return {
-        threads: rows.slice(0, pageSize),
+        threads: visible.slice(0, pageSize),
         hasMore: rows.length > pageSize,
       };
     },