{"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-berstreethouse-uu8p344g","versions":[{"created_at":"2026-06-10T13:20:01Z","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":"458f4e9196896f74f83211f96df8ef8438ef7f7ddaf4da0289dfd2714d9e6054","version":10},{"created_at":"2026-06-10T10:23:31Z","element_count":74,"note":"5軸GA polish 43->97 by M5 (autonomous)","saved_by":"mcp","sha256":"785e6d2f3f638ad3d2e36a56aadbf2978068c0d432c4372f8d7fadb08d854b0b","version":2}]}