{"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-p3s46g4d","versions":[{"created_at":"2026-06-13T15:02:50Z","element_count":73,"note":"5軸GA polish 43->94 by M5 (autonomous)","saved_by":"mcp","sha256":"9b7658237e8890e6943ffb43e45eaef0a2e41f34fc57bab7298b248fe0fd1c51","version":3},{"created_at":"2026-06-13T14:58:10Z","element_count":87,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"745cacd6604de865743e578fdb31d418fa521c36c2178b3d627ebfddb128059a","version":2},{"created_at":"2026-06-13T14:58:08Z","element_count":87,"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}]}