{"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-oaksfarmbarnshouse-ps0iwsef","versions":[{"created_at":"2026-06-10T17:08:44Z","element_count":90,"note":"5軸GA polish 43->97 by M5 (autonomous)","saved_by":"mcp","sha256":"8880d2baec49d0a408bec55fc58dd93dd6081b7852e6b3ceab85b8d9147f6fc0","version":2}]}