{"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-8520qtw5","versions":[{"created_at":"2026-08-04T06:09:58Z","element_count":122,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"48ff4d873870aa8546e5eda0c01c940dec81e0f93dab81233c40175ed3927399","version":2},{"created_at":"2026-08-04T06:09:58Z","element_count":122,"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}]}