{"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-nb10q82v","versions":[{"created_at":"2026-07-22T19:23:44Z","element_count":101,"note":"loop3: 設計時延床 70.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"db191dc8df98867ebac86f238e64e28cfdd6fc740c6e443fec393aa5410201a3","version":2},{"created_at":"2026-07-22T19:23:44Z","element_count":101,"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}]}