{"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-8vv51itk","versions":[{"created_at":"2026-06-10T08:15:45Z","element_count":90,"note":"5軸GA polish 52->98 by M5 (autonomous)","saved_by":"mcp","sha256":"265107ea9b79dc4f25b27f34b0111d7c526301f48a1bece86bd3d79253acbc47","version":2}]}