{"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-0wbz2k7d","versions":[{"created_at":"2026-06-10T13:16:27Z","element_count":65,"note":"backfill: 延床=居室床スラブ実面積90.0㎡(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":"99a73794a9f1e65acaf43599baef2d0bae076dd37f74ae5b9b9eb886c69df597","version":10},{"created_at":"2026-06-10T09:53:54Z","element_count":72,"note":"5軸GA polish 61->97 by M5 (autonomous)","saved_by":"mcp","sha256":"ea00e1e4eb298f54b5c044be48aa26d0c3de4674e2a965b1b65c11ab2feab42e","version":2}]}