{"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-qe38spfs","versions":[{"created_at":"2026-06-10T19:02:32Z","element_count":91,"note":"5軸GA polish 61->98 by M5 (autonomous)","saved_by":"mcp","sha256":"774b1cca70208f6ec92c785ffe0dc3a268ee2f1ce7c8396b4844ea0306c39d5f","version":3}]}