{"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-6wliqex5","versions":[{"created_at":"2026-06-11T02:39:08Z","element_count":89,"note":"5軸GA polish 46->98 by M5 (autonomous)","saved_by":"mcp","sha256":"660a1e53aa1d93e1f2d6c164078015d3c8314a927da1a5a1d1cb1495f7f4e416","version":3},{"created_at":"2026-06-11T02:29:57Z","element_count":52,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"1d813a286e9a7695e230b0dfb8ab6ad0f83e43f2a9632110a89e10917322e08d","version":2}]}