{"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-ecgzhuqy","versions":[{"created_at":"2026-06-10T17:56:19Z","element_count":91,"note":"5軸GA polish 61->98 by M5 (autonomous)","saved_by":"mcp","sha256":"d7668607273cc120bcc581d588eb5c5d4a9f9015cc6860e28a34d8e9e3711ab9","version":3}]}