{"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-2iygzwei","versions":[{"created_at":"2026-06-10T17:56:09Z","element_count":73,"note":"5軸GA polish 56->97 by M5 (autonomous)","saved_by":"mcp","sha256":"4f5eec93671d47e2107d2181a0596fea2330d2badf6e34c690126eed62a9892c","version":3}]}