Merge remote-tracking branch 'origin/main' into codex/im-channel-connections

# Conflicts:
#	backend/app/gateway/services.py
#	frontend/src/app/workspace/chats/page.tsx

frontend/tests/e2e/utils/mock-api.ts

@@ -86,7 +86,7 @@ export function mockLangGraphAPI(page: Page, options?: MockAPIOptions) {
   const skills = options?.skills ?? DEFAULT_SKILLS;
 
   // Thread search — sidebar thread list & chats list page
-  void page.route("**/api/langgraph/threads/search", (route) => {
+  void page.route("**/api/langgraph/threads/search", async (route) => {
     const body = threads.map((t) => ({
       thread_id: t.thread_id,
       created_at: "2025-01-01T00:00:00Z",
@@ -98,10 +98,33 @@ export function mockLangGraphAPI(page: Page, options?: MockAPIOptions) {
       status: "idle",
       values: { title: t.title ?? "Untitled" },
     }));
+
+    let limit: number | undefined;
+    let offset = 0;
+    try {
+      const postData = route.request().postDataJSON() as {
+        limit?: number;
+        offset?: number;
+      } | null;
+      if (postData) {
+        if (typeof postData.limit === "number") {
+          limit = postData.limit;
+        }
+        if (typeof postData.offset === "number") {
+          offset = postData.offset;
+        }
+      }
+    } catch {
+      // No / invalid JSON body — fall back to returning the full list.
+    }
+
+    const sliced =
+      typeof limit === "number" ? body.slice(offset, offset + limit) : body;
+
     return route.fulfill({
       status: 200,
       contentType: "application/json",
-      body: JSON.stringify(body),
+      body: JSON.stringify(sliced),
     });
   });