{"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-x90hknrj","versions":[{"created_at":"2026-07-24T21:32:20Z","element_count":109,"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 / 陸屋根PV設置 / 雨水タンク+中水 / 吹抜LDK / 南面大開口","saved_by":"mcp:create","sha256":"","version":1}]}