{"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-pb1pat2z","versions":[{"created_at":"2026-06-10T15:53:05Z","element_count":84,"note":"5軸GA polish 60->98 by M5 (autonomous)","saved_by":"mcp","sha256":"c609b87402c29031eb5f8184446b9051b89f89a1f7e4cabde0889fe33a8bbbb8","version":4}]}