{"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-oojkperq","versions":[{"created_at":"2026-06-10T19:02:33Z","element_count":83,"note":"5軸GA polish 61->98 by M5 (autonomous)","saved_by":"mcp","sha256":"9948669e6451734f69a1065dabdda019c4ebd37c9d3b2bf4ca29d7ac67645b4f","version":3}]}