{"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-00ugz8pg","versions":[{"created_at":"2026-07-31T06:51:47Z","element_count":101,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"66cab798f672bee74c56bf362ea6a09c1b06323c1ab78827c1c094605d1bf181","version":2},{"created_at":"2026-07-31T06:51:32Z","element_count":101,"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}]}