{"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-99mshlk3","versions":[{"created_at":"2026-06-10T18:46:38Z","element_count":85,"note":"5軸GA polish 60->97 by M5 (autonomous)","saved_by":"mcp","sha256":"ceab242e99ea8483fe47025dd505b2853f86b54bdabca71bf495e2f00d9f54b5","version":3}]}