{"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-8c3cx9ot","versions":[{"created_at":"2026-06-10T13:56:48Z","element_count":90,"note":"5軸GA polish 61->98 by M5 (autonomous)","saved_by":"mcp","sha256":"7120b9f804d4bcad2a5b0091938033e8a0e81cfb97ff05963b3d50df0d9db472","version":6},{"created_at":"2026-06-10T13:45:46Z","element_count":54,"note":"backfill: 延床=居室床スラブ実面積78.3㎡(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":"9b42815a820dd1dd5045191d6dead79e1f41f8d49f1b5d2420667311d6072b0f","version":5}]}