{"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-7y9fktqz","versions":[{"created_at":"2026-06-10T18:29:57Z","element_count":90,"note":"5軸GA polish 58->98 by M5 (autonomous)","saved_by":"mcp","sha256":"2db551bdcc42d9200a451417a08115d18909ebd1f3ee3dd9e1d2030016b44c6d","version":3}]}