{"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-rtg2efdg","versions":[{"created_at":"2026-07-15T13:45:23Z","element_count":165,"note":"言葉から生成: 中庭ロの字 / 中庭のある回遊動線・ロの字 / 中央中庭 / 回遊動線 / 南面採光 / 防火壁 / 断熱等級4","saved_by":"mcp:create","sha256":"","version":1}]}