{"note":"bim_versions 導入後の保存のみ記録 (それ以前は bim_canonical 上書きで履歴なし)","ok":true,"slug":"u-whitehouse-yz5vd12j","versions":[{"created_at":"2026-10-27T06:51:43Z","element_count":34,"note":"","saved_by":"editor","sha256":"910fdaeb480720750c600fa094ea29f5c9ce0b6e9cfa9d1023f6545dab3c34a0","version":2}]}