4a7c54be

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>

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