{"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-1pb7jbfy","versions":[{"created_at":"2026-06-10T18:29:57Z","element_count":84,"note":"5軸GA polish 61->98 by M5 (autonomous)","saved_by":"mcp","sha256":"ae757a9bf9ffbd04d7a5ed10ee4a00b4f50a40cfb0de28ee5bceae1ab2bb8e60","version":3}]}