{"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-q34b6l67","versions":[{"created_at":"2026-07-13T09:38:58Z","element_count":90,"note":"5軸GA polish 43->96 by M5 (autonomous)","saved_by":"mcp","sha256":"6cb3d77135fb27318caced1a5f67f5312da3587482bc3b5cc74d49d9105eda6c","version":3},{"created_at":"2026-07-13T09:25:04Z","element_count":105,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"8a29d28acf575e12424019dc72cd30875c80db8f4780744cca89cef45ee07bd9","version":2},{"created_at":"2026-07-13T09:25:04Z","element_count":105,"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}]}