{"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-uymdjbno","versions":[{"created_at":"2026-06-10T18:46:38Z","element_count":90,"note":"5軸GA polish 60->98 by M5 (autonomous)","saved_by":"mcp","sha256":"ef28a10a97bae08c15314a26a0fd073d34656cb64c6e73d91f58ab94ac9a2944","version":3}]}