Feishu Topic Spawn

Create a new Feishu topic in a dedicated topic-group, then optionally post the first thread reply inside it.

Keep this skill lightweight. Use it for topic creation and first-reply bootstrapping, not for session routing magic.

Validated behavior

This workflow has been verified:

1. feishu_im_user_message.send to a topic-group chat_id creates a new top-level topic.
2. feishu_im_user_message.reply with reply_in_thread=true posts inside that topic.
3. A reply can @ a user by placing Feishu text markup directly in the content:

<at user_id="ou_xxx">Name</at> 你好

This is the current working path. Prefer it over assumptions about implicit reply routing.