{"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-rcfyutp7","versions":[{"created_at":"2026-06-10T13:25:38Z","element_count":66,"note":"backfill: 延床=居室床スラブ実面積90.0㎡(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":"e6231fb23c0fd1790bc2c8ef9a149b07f22af53fca19de43837f879226126bfe","version":10},{"created_at":"2026-06-10T11:09:56Z","element_count":84,"note":"5軸GA polish 60->98 by M5 (autonomous)","saved_by":"mcp","sha256":"758e607a358243cbeed26e5a39506a47f7f68ee51dd0cc302d1d538cb2685e86","version":3}]}