fix(scheduled-task): enable worker by default and add WeChat preflight

Scheduled automations were saved but never executed because the worker
required an explicit env flag. Follow H5_REMINDER_WORKER_ENABLED when unset,
add WeChat preflight to write tasks deterministically, and surface worker
warnings on create.

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

wechat-mp.mjs

@@ -28,6 +28,7 @@ import {
 } from './wechat/customer-service-deferred.mjs';
 import { guardScheduleConfirmationReply } from './wechat/handlers/schedule-guard.mjs';
 import { handleWechatScheduleIntent } from './wechat/handlers/schedule.mjs';
+import { handleWechatScheduledTaskIntent } from './wechat/handlers/scheduled-task.mjs';
 import {
   buildStatusText,
   resolveSyncReply,
@@ -1564,6 +1565,7 @@ export function createWechatMpService({
   sessionApiFetch = null,
   submitSessionReply = null,
   scheduleService = null,
+  scheduledTaskService = null,
   wechatScheduleLlmConfigService = null,
   llmProviderService = null,
   chatIntentRouter = null,
@@ -3830,6 +3832,39 @@ export function createWechatMpService({
       };
     }
 
+    const scheduledTaskReply =
+      intent.msgType === 'text' || intent.msgType === 'voice'
+        ? await handleWechatScheduledTaskIntent({
+            intent,
+            user: boundUser,
+            scheduledTaskService,
+            logger,
+          }).catch((err) => {
+            logger.warn?.(
+              'WeChat MP scheduled task intent handling failed open:',
+              err instanceof Error ? err.message : err,
+            );
+            return null;
+          })
+        : null;
+    if (scheduledTaskReply) {
+      if (inbound.msgId && typeof userAuth.finishWechatMpMessage === 'function') {
+        await userAuth.finishWechatMpMessage({
+          appId: config.appId,
+          openid: inbound.fromUserName,
+          msgId: inbound.msgId,
+          status: 'done',
+          agentSessionId: null,
+        });
+      }
+      return {
+        ok: true,
+        status: 200,
+        contentType: 'application/xml; charset=utf-8',
+        body: await buildPassiveReplyBody(scheduledTaskReply),
+      };
+    }
+
     const scheduleReply =
       intent.msgType === 'text' || intent.msgType === 'voice'
         ? await handleWechatScheduleIntent({