Added mjx ray_hfield#2804

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finnBsch wants to merge 2 commits intogoogle-deepmind:mainfrom

finnBsch:feat/mjx-ray-hfield

Commits on Aug 15, 2025

Added mjx ray_hfield implementation. Matches the C version exactly, but requires static compilation of hfield size.
finnBsch
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Added tests for ray_hfield.
finnBsch
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