{"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-zndwjxml","versions":[{"created_at":"2026-06-10T17:39:56Z","element_count":84,"note":"5軸GA polish 54->97 by M5 (autonomous)","saved_by":"mcp","sha256":"afe31f497ba7f2e2180a05099d51dcedd7843b349d6654a99aae2691c2ee0a58","version":3}]}