Fix draft/update 47001: shape articles as single object - #16
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The update branch reused the draft/add payload (articles as array); draft/update requires a single article object and rejects the array with errcode 47001 (data format error). Root cause triple-verified: code read, official doc (articles: object), and a live A/B probe on XINZHE (array -> 47001, object -> ok). Add applyDraftUpdateShape and call it on a shallow copy at the update branch so downstream evidence bookkeeping keeps the array shape. Regression test pins both the object shape and the copy-at-call-site contract. Live-verified end-to-end on the relay with a probe draft (draft/update ok, completion_status: verified), probe cleaned up.
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问题
篇7 推送后修正作者字段时发现：
create_wechat_draft.mjs --update必挂，微信返回 47001 data format error。根因（三重验证）
articles为数组），仅追加 media_id/indexarticles类型是 object（单篇文章）修复
applyDraftUpdateShape（数组 → 单对象），update 分支在浅拷贝上调用——下游证据簿记（push-result/audit）继续读数组形状（第一版补丁就地转换曾导致articles[0]undefined，relay 现场验证抓到）test-draft-update-shape.mjs：钉住对象形状 + 拷贝调用契约验证
npm run check全绿（含新测试）--update，operation: draft/update、completion_status: verified，证据文件正常产出；探针已清理