{"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-newmaldensunrisehous-5pr6nnxf","versions":[{"created_at":"2026-06-10T16:55:13Z","element_count":73,"note":"5軸GA polish 43->97 by M5 (autonomous)","saved_by":"mcp","sha256":"a428c81c3a90557ed4d8665f5cb6120fb808479b432fd866cb21d5d42dfc9213","version":2}]}