Add implementation of mjd_ellipsoidFluid derivative#897

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vector-one wants to merge 4 commits intogoogle-deepmind:mainfrom

vector-one:feature/add-mjd-ellipsoidfluid-implementation

Commits on Dec 10, 2025

Add implementation of mjd_ellipsoidFluid derivative
vector-one
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Commits on Jan 2, 2026

Fix PR review suggestions: rename functions, use wp.cw_mul, replace MJ_MINVAL, restructure density checks, combine cross derivatives
vector-one
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Commits on Jan 8, 2026

Fix spatial_vector construction bug and add missing mat66 type definition
vector-one
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Commits on Jan 23, 2026

WIP: Add mjd_ellipsoidFluid derivative implementation (off-diagonal values need debugging)
vector-one
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