{"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-o2mzqvgz","versions":[{"created_at":"2026-06-10T18:29:57Z","element_count":84,"note":"5軸GA polish 53->98 by M5 (autonomous)","saved_by":"mcp","sha256":"c77fd928d27bdbd7514f4d7019dabcb5a1d00202c9615622f89c8e9f9a3f7062","version":3}]}