{"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-bs8ys301","versions":[{"created_at":"2026-06-10T13:14:39Z","element_count":77,"note":"backfill: 延床=居室床スラブ実面積87.5㎡(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":"a9f4a33b982d25e7fecae7ef8813bad9b914200654878870a3e6f9a7e9178e16","version":10},{"created_at":"2026-06-10T09:21:41Z","element_count":83,"note":"5軸GA polish 60->98 by M5 (autonomous)","saved_by":"mcp","sha256":"4d617f5d13effa39f72b54c154572d89df4a8cd05c0da07015fb2b8d34e0c025","version":2}]}