{"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-8a7th42m","versions":[{"created_at":"2026-07-13T09:38:57Z","element_count":84,"note":"5軸GA polish 46->97 by M5 (autonomous)","saved_by":"mcp","sha256":"f2cb700e05ec914131757a2da03ca3bcf7a8626b061572e60dd0cdff908fc1d8","version":3},{"created_at":"2026-07-13T09:27:29Z","element_count":126,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"39ef7b2771551a91496fd5294d16283a02ad497aa3e9c53e7dec230c61174ba1","version":2},{"created_at":"2026-07-13T09:27:29Z","element_count":126,"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}]}