{"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-lxbunpza","versions":[{"created_at":"2026-06-10T18:29:56Z","element_count":91,"note":"5軸GA polish 58->98 by M5 (autonomous)","saved_by":"mcp","sha256":"4d86be339993aec9a449e63a5a201f46640493cc4b9fa5bc29104f9045c0b050","version":3}]}