{"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-xtfwqi8g","versions":[{"created_at":"2026-06-10T07:42:21Z","element_count":89,"note":"5軸GA polish 47->98 by M5 (autonomous)","saved_by":"mcp","sha256":"5dfad865737a6b65a9b6d655bf589d7bb756f091a2be124cde6d465867f4c46f","version":2}]}