{"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-dp6rn4te","versions":[{"created_at":"2026-06-10T07:42:19Z","element_count":89,"note":"5軸GA polish 54->98 by M5 (autonomous)","saved_by":"mcp","sha256":"2680df062bf4e4e3f3887e2c123e35312f4e17d1495485bedd04e82dfab30d46","version":2}]}