{"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-thedownsfieldhouse-kuw7qnsl","versions":[{"created_at":"2026-06-11T04:11:13Z","element_count":90,"note":"5軸GA polish 47->98 by M5 (autonomous)","saved_by":"mcp","sha256":"b418f3ff01b5f6c3bc55532bafb895afd5a3a314b8ac7ac4303051c74ebfc9da","version":3},{"created_at":"2026-06-11T04:02:48Z","element_count":130,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"d7c07765945c34709d9fabdff7562e678bfdf5b2d205e5e53f5b54cfca528af9","version":2}]}