{"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-j766iof3","versions":[{"created_at":"2026-06-10T13:30:37Z","element_count":85,"note":"backfill: 延床=居室床スラブ実面積81.4㎡(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":"16958545b44ff36090385d755b100a5b3a75b5c0c420f6ea44ed883828430dd3","version":9},{"created_at":"2026-06-10T11:59:58Z","element_count":84,"note":"5軸GA polish 60->98 by M5 (autonomous)","saved_by":"mcp","sha256":"c34ded7d9deab8260befc0008729b31c464a03a92d5f155efa37800143bf6842","version":4}]}