fix: require docx generation for downloadable pages

wechat-mp.test.mjs

@@ -4,6 +4,7 @@ import fs from 'node:fs';
 import path from 'node:path';
 import test from 'node:test';
 import {
+  buildWechatAgentPrompt,
   buildWechatTextReply,
   createWechatMpService,
   guardMissingPublicHtmlLinks,
@@ -128,6 +129,25 @@ test('splitWechatText respects WeChat 2048-byte customer service limit', () => {
   assert.equal(chunks.join(''), longChinese);
 });
 
+test('buildWechatAgentPrompt requires docx generation before html when Word download is requested', () => {
+  const prompt = buildWechatAgentPrompt({
+    msgType: 'text',
+    content: '帮我生成一个行业分布报告页面，提供链接word给我来下载',
+  });
+  assert.match(prompt, /docx-generate/);
+  assert.match(prompt, /public\/\*\.docx/);
+  assert.match(prompt, /static-page-publish/);
+});
+
+test('buildWechatAgentPrompt keeps normal html guidance without docx requirement for plain page requests', () => {
+  const prompt = buildWechatAgentPrompt({
+    msgType: 'text',
+    content: '帮我生成一个简单页面',
+  });
+  assert.match(prompt, /static-page-publish/);
+  assert.doesNotMatch(prompt, /docx-generate/);
+});
+
 test('guardMissingPublicHtmlLinks blocks missing MindSpace public html links', async () => {
   const text =
     '页面已创建：\nhttps://m.tkmind.cn/MindSpace/a70ff537-8908-486e-9b6c-042e07cc25db/public/missing.html';