{"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-petterhousebungalow-i4b3pdxb","versions":[{"created_at":"2026-08-05T00:37:25Z","element_count":101,"note":"loop3: 設計時延床 78.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"55ea623e6d371b1f9ed4c79668d3f6d18b69f11ab9d903fdeec47fdce639e10f","version":2},{"created_at":"2026-08-05T00:37:25Z","element_count":101,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}