{"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-willowbrookhouse-hpxkzljf","versions":[{"created_at":"2026-08-20T16:01:38Z","element_count":101,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"4cb52fcf344e8b9c83de620b03a30cec1b9146484fb6b7b29679cc1ff17c4658","version":2},{"created_at":"2026-08-20T16:01:37Z","element_count":101,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}