{"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-35kivoqg","versions":[{"created_at":"2026-06-10T18:29:57Z","element_count":84,"note":"5軸GA polish 54->98 by M5 (autonomous)","saved_by":"mcp","sha256":"fd46fd556c5901e3135cd0b45306f67d22ed087ed48a45184485cf7dac820d30","version":3}]}