{"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-ardennessunrisebunga-1ocfdb9w","versions":[{"created_at":"2026-06-10T17:08:47Z","element_count":72,"note":"5軸GA polish 43->97 by M5 (autonomous)","saved_by":"mcp","sha256":"312baf726e7c48cac8aa6384c1224b716aac1fe6098304c1b55591db15236819","version":2}]}