{"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-brusselsmeadowhouse-lmg4ff6v","versions":[{"created_at":"2026-06-10T17:23:28Z","element_count":72,"note":"5軸GA polish 43->96 by M5 (autonomous)","saved_by":"mcp","sha256":"fdd9b3e3181fe29a34bb498c14781837cbec6ebaf84c49c210e29ac94ddf3e2d","version":2}]}