{"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-33-fk6hr63o","versions":[{"created_at":"2026-10-27T06:55:34Z","element_count":425,"note":"","saved_by":"editor","sha256":"0c3336110af7eeccd528aad6edb92217a9ddadf27f6663c45c7de81c30e7652b","version":2}]}