{"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-s6h8pwdz","versions":[{"created_at":"2026-08-04T06:37:23Z","element_count":122,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"76ae889c769425d946fcbf56c213f39dd48ad10b01cb08973f52747ae6195110","version":2},{"created_at":"2026-08-04T06:37:22Z","element_count":122,"note":"言葉から生成: LDK+主寝室+子供室2+浴室+収納","saved_by":"mcp:create","sha256":"","version":1}]}