{"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-bd8in1g8","versions":[{"created_at":"2026-06-10T07:25:38Z","element_count":89,"note":"5軸GA polish 60->98 by M5 (autonomous)","saved_by":"mcp","sha256":"92756cc64270b9a633d3d0f1bdb29ce4f65e11993af4c91dc15ab54052258b15","version":2}]}