By: lcnbr <im@lcnbr.ch>
add standalone xbox sum, soft-triangle, and thrown-out diagrams Standalone documents sharing xbox-common.typ take over from the removed single-file xbox example: the xbox sum with configured cut heights and endpoint cuts, the soft triangle, and the thrown-out routings. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>