{"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-holmesdalebungalow-ai4uayhj","versions":[{"created_at":"2026-07-26T00:37:05Z","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":"683e73b5ad655985ea293276bc4ba23efd976fc4a9285af4fcbf79526c39db9a","version":2},{"created_at":"2026-07-26T00:37:02Z","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}]}