{"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-52wf8nui","versions":[{"created_at":"2026-06-10T19:02:33Z","element_count":91,"note":"5軸GA polish 61->98 by M5 (autonomous)","saved_by":"mcp","sha256":"49668ff52ca6ef66092a255507e387fe3653106aa9dec5fbfefa5beae57c2931","version":3}]}