Keep in-editor asset curation off the head, layering it like every edit

ensure_autosave! gives body keystrokes and asset curation one shared
layer, so head is never mutated in place and every curation change
surfaces in the publish delta. Stale rendered join ids are mapped
across the clone via asset_id. Curation now requires holding the
lock; a missing lock answers 423, matching the autosave endpoint.

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