{"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-x3ohq8lt","versions":[{"created_at":"2026-06-10T07:42:16Z","element_count":83,"note":"5軸GA polish 61->98 by M5 (autonomous)","saved_by":"mcp","sha256":"39625b8f62f6a4ad31dadee8b44d56dde29890d2fd22bcdb3fbbea18999c8864","version":2}]}