{"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-b99p4mp9","versions":[{"created_at":"2026-07-26T07:29:54Z","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":"1963c46ec86450207ca21fa3de2a439863f973ba595503e8b92131c8e2a38df9","version":2},{"created_at":"2026-07-26T07:29:52Z","element_count":134,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}