{"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-9l5x3t5s","versions":[{"created_at":"2026-06-29T16:44:35Z","element_count":149,"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","saved_by":"mcp:create","sha256":"","version":1}]}