{"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-h1tdjaj5","versions":[{"created_at":"2026-06-10T13:14:02Z","element_count":77,"note":"backfill: 延床=居室床スラブ実面積77.3㎡(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":"fda8e0844e872ee07a1763d9bb656605fd2752f99a1b6786c582806b2ca1ef71","version":10},{"created_at":"2026-06-10T09:05:33Z","element_count":84,"note":"5軸GA polish 56->98 by M5 (autonomous)","saved_by":"mcp","sha256":"ee6bbf94ea6f09220de3b37efb191102b3d48ec21c64e022d868b3069cf6c9de","version":2}]}