{"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-gn3s41eq","versions":[{"created_at":"2026-06-10T13:13:15Z","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":"11fce66ac776e5d57aa88f75f17df534382494105c29250dbba0496941c1e1c1","version":10},{"created_at":"2026-06-10T09:05:31Z","element_count":89,"note":"5軸GA polish 61->98 by M5 (autonomous)","saved_by":"mcp","sha256":"abd2c5135c0c404bbc8669d001f39c745000de1a2a08366624437fe3669d569f","version":2}]}