{"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-6qtzv8uq","versions":[{"created_at":"2026-06-10T13:09:33Z","element_count":66,"note":"backfill: 延床=居室床スラブ実面積106.2㎡(基礎/屋外/ロフト除外)。設備数量/コスト過大の是正","saved_by":"mcp","sha256":"4fb27fe1c52f2bed0d966acee981ace53419ee94a71452779abc9af9a525ada7","version":11},{"created_at":"2026-06-10T07:59:41Z","element_count":91,"note":"5軸GA polish 60->98 by M5 (autonomous)","saved_by":"mcp","sha256":"5e3f10b6cb6ac5019f6ece135c3eadd757e45e225eabbdad80efd5e75cdb2906","version":2}]}