{"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-3itq1f5p","versions":[{"created_at":"2026-06-10T17:56:36Z","element_count":84,"note":"5軸GA polish 59->97 by M5 (autonomous)","saved_by":"mcp","sha256":"6d096a865084c14b3e8479d2e1e1cd0999b2fd58411ca4aab0763845f261185b","version":3}]}