{"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-e0w7b64p","versions":[{"created_at":"2026-08-04T15:51:34Z","element_count":216,"note":"言葉から生成: 総2階(箱) / 狭小の町家・吹抜・坪庭 / 吹抜 / 坪庭 / 高気密 / 雪対策屋根 / 南面採光強化","saved_by":"mcp:create","sha256":"","version":1}]}