{"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-vhn24fpm","versions":[{"created_at":"2026-06-10T14:29:25Z","element_count":84,"note":"5軸GA polish 60->98 by M5 (autonomous)","saved_by":"mcp","sha256":"bb54376944c0dae69b067696f03f7c9d11c4933e849b43a808e6a90a7503d6ce","version":7}]}