{"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-7vuv0d7u","versions":[{"created_at":"2026-06-10T18:46:37Z","element_count":72,"note":"5軸GA polish 61->95 by M5 (autonomous)","saved_by":"mcp","sha256":"8e028195aa6ed47cc0596297020f4bcc9d7c1b9d6fd7aa30b34d6483757c9e39","version":3}]}