{"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-12i49vzd","versions":[{"created_at":"2026-06-10T17:56:24Z","element_count":84,"note":"5軸GA polish 58->98 by M5 (autonomous)","saved_by":"mcp","sha256":"7d1e77bdde2990961fc24b74d7408f4140eeb92ac316abba4d7f0bc421feaa5f","version":3}]}