{"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-ioypzgda","versions":[{"created_at":"2026-06-10T17:56:05Z","element_count":90,"note":"5軸GA polish 60->98 by M5 (autonomous)","saved_by":"mcp","sha256":"5c2cd015828d419e80a0da6e7fb98076ad4463f5de3af5c3daa7a23a5f69bce3","version":3}]}