{"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-7avyg1er","versions":[{"created_at":"2026-06-10T17:56:15Z","element_count":84,"note":"5軸GA polish 61->97 by M5 (autonomous)","saved_by":"mcp","sha256":"db0d51e4ccd7923e6a66b3e95fab70f8edb77a5fb2fc88b9075a022bf64d9e4f","version":3}]}