{"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-to38th24","versions":[{"created_at":"2026-06-10T13:24:20Z","element_count":77,"note":"backfill: 延床=居室床スラブ実面積74.1㎡(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":"458f4e9196896f74f83211f96df8ef8438ef7f7ddaf4da0289dfd2714d9e6054","version":10},{"created_at":"2026-06-10T10:53:18Z","element_count":73,"note":"5軸GA polish 60->97 by M5 (autonomous)","saved_by":"mcp","sha256":"59fdea40119aada9ab905e23458602abcb0e90ee681d4542f7812185ab988473","version":3}]}