{"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-9ka2jj4v","versions":[{"created_at":"2026-06-11T01:05:14Z","element_count":89,"note":"5軸GA polish 47->98 by M5 (autonomous)","saved_by":"mcp","sha256":"0352ea087a9d146c5fa9e72de642ed8f9bce6ac0f96cbb23db55bb3e3d54c373","version":12},{"created_at":"2026-06-10T22:33:18Z","element_count":46,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"d9d276523973f216149f89c9f96d0d8cbe62892b41ce1a56b33f75e56cd6a2f5","version":2}]}