fix(rectification): keep adopt narration timeout on a clearable ref timer

AbortSignal.timeout() is unref'd, so a hanging generateText drained the test event loop and cancelled the rest of the file. Clear the timer after the model returns.

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

frontend/tests/rectification-adopt-narration-20260904.test.ts

@@ -943,6 +943,49 @@ test("adopt narration times out to the template without throwing", async () => {
   assert.equal(timed.text, fallback);
 });
 
+test("adopt narration does not leave an active timeout after the model returns", async () => {
+  const dossier = caseDossier();
+  const decision = decideFromDossier(dossier, { birthDate: "1997-08-08" });
+  const facts = adoptDeliveryFacts(decision, dossier);
+  const fallback = "剩下的问题分不开 05:00 和 05:06。可以从下面选一个先用着。";
+  const kept = "剩下的问题分不开 05:00 和 05:06。范围是 05:00 到 05:06。采用后会用 2016 年学业核对。";
+  const source = readFileSync(
+    new URL("../src/lib/rectification-agentic/v9/adopt-narration-agent.ts", import.meta.url),
+    "utf8",
+  );
+  assert.doesNotMatch(source, /AbortSignal\.timeout/);
+  assert.match(source, /clearTimeout/);
+
+  const pending = new Set<unknown>();
+  let created = 0;
+  const realSetTimeout = globalThis.setTimeout;
+  const realClearTimeout = globalThis.clearTimeout;
+  globalThis.setTimeout = ((handler: TimerHandler, delay?: number, ...args: unknown[]) => {
+    created += 1;
+    const id = realSetTimeout(handler, delay, ...args);
+    pending.add(id);
+    return id;
+  }) as typeof setTimeout;
+  globalThis.clearTimeout = ((id?: ReturnType<typeof setTimeout>) => {
+    pending.delete(id);
+    realClearTimeout(id);
+  }) as typeof clearTimeout;
+  try {
+    const delivered = await deliverAdoptNarration({
+      facts,
+      fallback,
+      timeoutMs: 8_000,
+      generateText: async () => kept,
+    });
+    assert.equal(delivered.adopt_narration, "agent");
+    assert.ok(created >= 1);
+    assert.equal(pending.size, 0);
+  } finally {
+    globalThis.setTimeout = realSetTimeout;
+    globalThis.clearTimeout = realClearTimeout;
+  }
+});
+
 test("applyCollectFocusDenial on the family collect uses the same adopt template", async () => {
   const dossier = caseDossier();
   let loads = 0;