{"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-2p9o5pa4","versions":[{"created_at":"2026-06-10T13:14:54Z","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":"d644fde2885decc44afb827cdaebdf59663253f1c60374de245be308adde0d1f","version":10},{"created_at":"2026-06-10T09:21:35Z","element_count":85,"note":"5軸GA polish 61->98 by M5 (autonomous)","saved_by":"mcp","sha256":"a8a973496e2dfeed1967073f434c2cc744c095f7cf6764d50f4b61a4aa9a4f29","version":2}]}