Add smart ACK provider for WeChat MP replies

Replace fixed ackText with a rule-based AckProvider that picks
response templates by message type and intent (translate, summary,
rewrite, poster, ppt, mindmap, code, search, schedule). Pure sync,
zero I/O, auto-falls back to config.ackText on any error.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

user-space.test.mjs

@@ -4,8 +4,10 @@ import os from 'node:os';
 import path from 'node:path';
 import test from 'node:test';
 import {
+  buildUserSpaceConstraints,
   ensureUserZoneDirs,
   mirrorAssetToZone,
+  renderUserSpaceHints,
   resolveUserWorkspaceRoot,
   syncUserZonesFromAssets,
   UPLOAD_ZONE_CODES,
@@ -60,3 +62,26 @@ test('syncUserZonesFromAssets backfills from canonical storage', async () => {
     fs.existsSync(path.join(workspace, 'oa', '2025-12-06T13-34_export.csv')),
   );
 });
+
+test('user space publishing guidance points to sandbox file tools', () => {
+  const workspaceRoot = `/var/h5/MindSpace/${USER_ID}`;
+  const hints = renderUserSpaceHints({
+    username: 'john',
+    displayName: 'John',
+    slug: USER_ID,
+    workspaceRoot,
+  });
+  const constraints = buildUserSpaceConstraints({
+    username: 'john',
+    displayName: 'John',
+    slug: USER_ID,
+    workspaceRoot,
+    publicBaseUrl: 'https://m.tkmind.cn',
+  });
+  assert.match(hints, /write_file/);
+  assert.match(hints, /edit_file/);
+  assert.doesNotMatch(hints, /再使用 \\`write\\` 创建/);
+  assert.match(constraints, /write_file/);
+  assert.match(constraints, /edit_file/);
+  assert.doesNotMatch(constraints, /再用 `write` 写入/);
+});