Reuse sender metadata and the existing AI Card lifecycle to include native mentions in ordinary group answers. Preserve mentions across progress, completion, and cleanup without sending a separate reminder.
Verified with npm run check (1671 tests) and a real ordinary Q&A in the existing DingTalk test group.
Add regression coverage for group mention chunks, private replies, mention payloads, and batch reply failure handling. Credit divingleee in package contributors and rebuild the checked-in bundles.