{"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-ravelstondykesviewho-c6dslhvq","versions":[{"created_at":"2026-06-10T17:08:51Z","element_count":73,"note":"5軸GA polish 43->93 by M5 (autonomous)","saved_by":"mcp","sha256":"385d98eb6a2f339fc32acae5ace68994797ebfb16b51a2055235c9e27f8b686f","version":2}]}