{"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-5e7ne4lg","versions":[{"created_at":"2026-08-14T09:15:44Z","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":"069774e0525f7b3a6d1206c7c5573844f24f6d3eba179d6ed3582ad6ec77484c","version":2},{"created_at":"2026-08-14T09:15:42Z","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}]}