{"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-bufuywyx","versions":[{"created_at":"2026-06-10T17:23:03Z","element_count":72,"note":"5軸GA polish 60->92 by M5 (autonomous)","saved_by":"mcp","sha256":"64ea29443b5db4e8cf57dbd5a02afa069fc9d86b8868d7664b5fd65f74a50e6d","version":2}]}