{"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-d2cf1159","versions":[{"created_at":"2026-06-10T15:19:28Z","element_count":73,"note":"5軸GA polish 61->97 by M5 (autonomous)","saved_by":"mcp","sha256":"f4f086ad3078b12aeccd13e6418b85f4534796bd5fb71bc6c0c98c6e9caffdb1","version":5}]}