{"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-wandsworthmillhouse-z76vmut2","versions":[{"created_at":"2026-07-24T11:44:49Z","element_count":119,"note":"loop3: 設計時延床 70.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"e823db25947c19f6b8662bd8ad68adf5c6a013f44e08ec27c93269ae250077bc","version":2},{"created_at":"2026-07-24T11:44:48Z","element_count":119,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}