fix(scheduled-task): improve live verify and short delivery acceptance

Extend live verify wait budget to cover Agent execution timeout, use a
deterministic smoke taskSpec, and accept concise successful replies like
「验证成功」 instead of treating them as non-delivery.

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

scheduled-task-executor.test.mjs

@@ -36,6 +36,9 @@ test('looksLikeScheduledTaskNonDelivery detects clarification replies', () => {
     looksLikeScheduledTaskNonDelivery('好的', { readyPaths: ['public/news.html'] }),
     false,
   );
+  assert.equal(looksLikeScheduledTaskNonDelivery('验证成功'), false);
+  assert.equal(looksLikeScheduledTaskNonDelivery('已完成'), false);
+  assert.equal(looksLikeScheduledTaskNonDelivery('好的'), true);
 });
 
 test('extractScheduledTaskDeliveryText reads last assistant message', () => {