feat: show owners a live worker status snapshot

While a worker turn is running, the assistant prompt for the working
proposal's owner includes a compact status card (elapsed time, last
tool activity category with age, per-category counts) built from the
ACP session/update stream the runtime already receives. Other users
still see only the desensitized busy state, and raw update content
never enters the assistant session.

test/assistant-manager.test.ts

@@ -722,6 +722,53 @@ test("image attachments degrade to a text note when the agent has no image capab
   }
 });
 
+test("the owner sees a live worker activity card while others get only a sanitized busy state", async () => {
+  const harness = await createHarness();
+  try {
+    await harness.manager.prompt(request("create proposal: toolhang", "user-a"));
+    const proposal = harness.proposals.list()[0]!;
+    await harness.manager.prompt(request("confirm", "user-a"));
+    const internals = harness.manager as unknown as {
+      active?: { activity: { turnStartedAt?: number; lastActivityAt?: number; lastCategory?: string; counts: Record<string, number> } };
+    };
+    await waitFor(() => (internals.active?.activity.counts.read || 0) === 2);
+
+    const activity = internals.active!.activity;
+    assert.equal(activity.lastCategory, "execute");
+    assert.equal(activity.counts.read, 2);
+    assert.equal(activity.counts.execute, 1);
+    assert.ok(activity.turnStartedAt);
+    assert.ok(activity.lastActivityAt);
+
+    await harness.manager.prompt(request("进度如何", "user-a"));
+    await harness.manager.prompt(request("进度如何", "user-b"));
+    const progressPrompts = readLog(harness.logFile).filter((entry) => entry.method === "session/prompt"
+      && entry.text?.startsWith("[User message]\n进度如何"));
+    assert.equal(progressPrompts.length, 2);
+    const ownerPrompt = progressPrompts[0]!.text!;
+    assert.match(ownerPrompt, /title="Test proposal" running=\d{2}:\d{2}/);
+    assert.match(ownerPrompt, /lastActivity=execute \(\d+s ago\)/);
+    assert.match(ownerPrompt, /counts: read×2 execute×1/);
+    assert.match(ownerPrompt, /real-time snapshot of the worker/);
+    const otherPrompt = progressPrompts[1]!.text!;
+    assert.match(otherPrompt, /details hidden/);
+    assert.doesNotMatch(otherPrompt, /lastActivity=/);
+    assert.doesNotMatch(otherPrompt, /Test proposal/);
+
+    // Once the worker is no longer working, the card disappears.
+    assert.equal(await harness.manager.stop("webhook", "chat-1", "user-a"), true);
+    assert.equal(harness.proposals.get(proposal.id)!.status, "pending");
+    await harness.manager.prompt(request("hello", "user-a"));
+    const idlePrompts = readLog(harness.logFile).filter((entry) => entry.method === "session/prompt"
+      && entry.text?.startsWith("[User message]\nhello"));
+    assert.equal(idlePrompts.length, 1);
+    assert.match(idlePrompts[0]!.text!, /no active worker/);
+    assert.doesNotMatch(idlePrompts[0]!.text!, /lastActivity=/);
+  } finally {
+    await closeHarness(harness);
+  }
+});
+
 test("an assistant session idle beyond the reset threshold is dropped when the owner has no unfinished proposal", async () => {
   const harness = await createHarness();
   try {