{"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-house-41zt66x3","versions":[{"created_at":"2026-06-11T02:28:18Z","element_count":83,"note":"5軸GA polish 42->94 by M5 (autonomous)","saved_by":"mcp","sha256":"a061f664f51a9579c7a7c8d165059ecef987d517d7cb07c0d7fd0d33efee8b47","version":3},{"created_at":"2026-06-11T02:25:46Z","element_count":48,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"b5f47897f42b0321a8baf89bbb0887d99bfe53c6dd6d36dc5c49cb576b99cacb","version":2}]}