{"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-287468vz","versions":[{"created_at":"2026-06-10T13:13:31Z","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":"2026-06-10T09:05:07Z","element_count":74,"note":"5軸GA polish 56->97 by M5 (autonomous)","saved_by":"mcp","sha256":"ca600deddcf594681504f58fd0b212b99c0daa7d84511aaada0d0b7d1caf3eab","version":2}]}