{"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-14u5n4x1","versions":[{"created_at":"2026-06-10T13:14:45Z","element_count":63,"note":"backfill: 延床=居室床スラブ実面積118.8㎡(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":"22f758fc214cd6fc7e2763482abdc69ac7ed6cb25a5f56d82d318cffadaaf9b5","version":10},{"created_at":"2026-06-10T09:21:45Z","element_count":84,"note":"5軸GA polish 53->98 by M5 (autonomous)","saved_by":"mcp","sha256":"0080de40d11255c4852acf9cc39c3316085cd5384156442ee1174241dff6a901","version":2}]}