{"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-a3k6e8ng","versions":[{"created_at":"2026-06-10T18:46:39Z","element_count":84,"note":"5軸GA polish 56->98 by M5 (autonomous)","saved_by":"mcp","sha256":"7b104c4dab5b3a8683dbb71efc0ac8d18bc226fac2df93bfb043fc29e6d100dc","version":3}]}