{"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-ebk1mdnw","versions":[{"created_at":"2026-06-17T18:20:21Z","element_count":168,"note":"言葉から生成: 中庭ロの字 / ピアノ室と防音・吹抜のある家 / 吹抜 / ピアノ室 / 防音構造 / 中庭","saved_by":"mcp:create","sha256":"","version":1}]}