{"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-v3uk985v","versions":[{"created_at":"2026-06-11T18:18:00Z","element_count":128,"note":"言葉から生成: 中庭ロの字 / 茶室と縁側のある和の住まい / 吹抜 / 縁側 / 茶室 / 中庭 / 断熱規制対応","saved_by":"mcp:create","sha256":"","version":1}]}