{"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-j53xzjnw","versions":[{"created_at":"2026-07-22T19:28:07Z","element_count":86,"note":"loop3: 設計時延床 55.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"6b83a7094f66d940853a8c1e7c93673c1f1293d38e8371ec094480b3badec81e","version":2},{"created_at":"2026-07-22T19:28:07Z","element_count":86,"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}]}