{"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-jvy8r7ea","versions":[{"created_at":"2026-06-10T18:46:38Z","element_count":84,"note":"5軸GA polish 56->98 by M5 (autonomous)","saved_by":"mcp","sha256":"b4f83c66cd77b6877a0230942129abe61be23309e9148f19870be17f18e61451","version":3}]}