Drafts previously stopped at the草稿箱 step, leaving the operator to publish
manually. Chain a /cgi-bin/masssend call, then poll the appmsgpublish list
(by title and by latest) to extract the mp.weixin.qq.com/s public link
and a publish_id. Surface dedicated failures for publish and link-missing
states, and switch the result payload to publish_type="publish" with the
appmsgpublish manage URL.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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