{"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-house-4rifehoj","versions":[{"created_at":"2026-06-10T13:13:25Z","element_count":62,"note":"backfill: 延床=居室床スラブ実面積118.8㎡(基礎/屋外/ロフト除外)。設備数量/コスト過大の是正","saved_by":"mcp","sha256":"81bd63c29560cfb62c478a526bb109716fa205d03875648096eaacf07f64954f","version":10},{"created_at":"2026-06-10T09:04:58Z","element_count":85,"note":"5軸GA polish 61->98 by M5 (autonomous)","saved_by":"mcp","sha256":"6ab6437d862e1c33143e11285898020a260f83f8bb03bf72931e47cfd48740b9","version":2}]}