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>

skills-registry.mjs

@@ -13,8 +13,10 @@ const __dirname = path.dirname(fileURLToPath(import.meta.url));
 export const DEFAULT_USER_SKILLS = {
   web: true,
   search: true,
+  'schedule-assistant': true,
   'form-builder': true,
   'table-viewer': true,
+  'product-campaign-page': true,
   [PUBLISH_SKILL_NAME]: false,
 };