{"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-w15lqj3u","versions":[{"created_at":"2026-08-01T12:08:24Z","element_count":85,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"e59362deef92c9fca2df84d0c844a19b95e97c28dd6fde3d48efc05702b1129d","version":2},{"created_at":"2026-08-01T12:08:22Z","element_count":85,"note":"言葉から生成: LDK+主寝室+子供室2+浴室+収納","saved_by":"mcp:create","sha256":"","version":1}]}