{"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-y79ag6ug","versions":[{"created_at":"2026-06-10T13:08:53Z","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":"bb41e9394bbba181693e6c4f29ceaa9ba04e5c44dafe3f117aa8884012448d16","version":11},{"created_at":"2026-06-10T07:42:27Z","element_count":89,"note":"5軸GA polish 53->98 by M5 (autonomous)","saved_by":"mcp","sha256":"74f13a85cd3615076f08f16005c73e39f6732fab56977335f4170341d7805615","version":2}]}