{"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-uty4b87p","versions":[{"created_at":"2026-08-01T19:10:00Z","element_count":148,"note":"言葉から生成: L字 / 越屋根のある自然素材の家・通風重視 / 越屋根(吹抜) / 高窓採光 / 対向窓通風路 / 吹抜 / 土間","saved_by":"mcp:create","sha256":"","version":1}]}