{"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-hilltophavenhouse-h4x8h54z","versions":[{"created_at":"2026-06-10T17:08:44Z","element_count":70,"note":"5軸GA polish 43->96 by M5 (autonomous)","saved_by":"mcp","sha256":"30ec19e4465e6b52ed7401bf5fa38e8c06824a507fe0748e23ceb456ac4d5a4f","version":2}]}