{"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-higherlanehouse-vj7rqkch","versions":[{"created_at":"2026-06-10T13:22:47Z","element_count":77,"note":"backfill: 延床=居室床スラブ実面積77.0㎡(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":"d0e7500d0db456f72797132275e86e2fbaba136fc20c40270faa7b42474b19e4","version":10},{"created_at":"2026-06-10T10:37:44Z","element_count":90,"note":"5軸GA polish 43->98 by M5 (autonomous)","saved_by":"mcp","sha256":"40f17feccf6537c032b7595d6964b1e6d613bc6a16bd2a1b28962880a6d8ace8","version":2}]}