{"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-pgrmwafn","versions":[{"created_at":"2026-08-20T16:05:09Z","element_count":86,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"c93c41e733b12b502085f28b59c5f511f1a9d02c5144a4dcffacae4741f7a765","version":2},{"created_at":"2026-08-20T16:05:08Z","element_count":86,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}