{"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-nj66vwi9","versions":[{"created_at":"2026-06-10T18:29:58Z","element_count":85,"note":"5軸GA polish 60->98 by M5 (autonomous)","saved_by":"mcp","sha256":"f88052bc0f242ca87c99b5040b5dbc96bb9130dff5c3abb3e6ba444c29b8d0fc","version":3}]}