{"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-6rup13mc","versions":[{"created_at":"2026-07-18T13:05:09Z","element_count":253,"note":"言葉から生成: 総2階(箱) / 二世帯住宅・玄関2つ・水回り分離 / 吹抜けLDK / 階段下収納 / 吹抜け階段 / 吹抜け階段 / 吹抜け階段","saved_by":"mcp:create","sha256":"","version":1}]}