{"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-amyl33vm","versions":[{"created_at":"2026-06-10T17:56:35Z","element_count":90,"note":"5軸GA polish 60->98 by M5 (autonomous)","saved_by":"mcp","sha256":"1c69cf51f0397e64d82c4527d252a518b08d6935ba8764c228c1fd25af5b1ad8","version":3}]}