{"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-kc15tlir","versions":[{"created_at":"2026-06-12T13:19:17Z","element_count":144,"note":"言葉から生成: 中庭ロの字 / 狭小の町家・吹抜・坪庭 / 吹抜ロビー / 坪庭(中庭) / 玄関ホール / 多雪対応屋根勾配 / 高断熱仕様","saved_by":"mcp:create","sha256":"","version":1}]}