{"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-a3y9y39d","versions":[{"created_at":"2026-06-10T17:56:43Z","element_count":73,"note":"5軸GA polish 60->97 by M5 (autonomous)","saved_by":"mcp","sha256":"ff60a9884dbc9db6bf91dfc6abd42dded61f7d37d4f1b729242d52740c5ab8fc","version":3}]}