{"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-q7lzqb53","versions":[{"created_at":"2026-07-24T06:24:35Z","element_count":134,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"0b40d588d7a13886ba3361610e864a853268bd7d4c15fd228f869fc4590e9bfe","version":2},{"created_at":"2026-07-24T06:24:29Z","element_count":134,"note":"言葉から生成: LDK+主寝室+子供室+浴室+収納","saved_by":"mcp:create","sha256":"","version":1}]}