{"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-willowcreekbungalow-2snk4kbh","versions":[{"created_at":"2026-07-24T11:52:43Z","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":"70195ad9ad28d893ae97e95e685b8610bf72f860ea6ddcf0bbb1030046ce3851","version":2},{"created_at":"2026-07-24T11:52:35Z","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}]}