{"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-manchesterroadgableh-ue75ezdl","versions":[{"created_at":"2026-06-10T13:22:44Z","element_count":77,"note":"backfill: 延床=居室床スラブ実面積87.5㎡(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":"a9f4a33b982d25e7fecae7ef8813bad9b914200654878870a3e6f9a7e9178e16","version":10},{"created_at":"2026-06-10T10:37:40Z","element_count":89,"note":"5軸GA polish 43->98 by M5 (autonomous)","saved_by":"mcp","sha256":"034abedfbd56f7a5b23c2aae8e4db362839e59ae4e9986900e31a702f8fa1de0","version":2}]}