feat(wechat): add Intent Transaction Layer with unified task schema

Introduce Draft → Confirm → Commit flow for WeChat schedule intents behind
feature flags, plus h5_tasks dual-write/read aggregation and rollout scripts
so reminders and automations get explicit user confirmation before persisting.

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

intent-query-guard.test.mjs

@@ -0,0 +1,19 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+import { detectQueryGuard } from './intent-query-guard.mjs';
+import { classifyUserIntent } from './intent-classifier.mjs';
+
+test('detectQueryGuard treats scheduled task inventory as read-only query', () => {
+  assert.equal(detectQueryGuard('有没有我的新闻定时任务'), true);
+  assert.equal(detectQueryGuard('看看有没有定时自动任务'), true);
+});
+
+test('detectQueryGuard does not treat cancel/manage wording as query', () => {
+  assert.equal(detectQueryGuard('取消每日新闻任务'), false);
+});
+
+test('classifyUserIntent routes scheduled task inventory to L0', () => {
+  const result = classifyUserIntent('有没有我的新闻定时任务');
+  assert.equal(result.layer, 'L0');
+  assert.equal(result.kind, 'query');
+});