{"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-pv-ov4y5b6h","versions":[{"created_at":"2026-06-13T21:22:00Z","element_count":103,"note":"言葉から生成: 平屋(矩形) / 雨水利用とPVのオフグリッド志向・平屋 / 太陽光発電 / 雨水溜め / 高断熱 / 吹抜 / 物置","saved_by":"mcp:create","sha256":"","version":1}]}