Update to Work with Eigen 5.0.0#536

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EricaCMitchell wants to merge 9 commits intomasterfrom

emitchell/upgrade/eigen-5.x.x

Commits on Feb 2, 2026

Eigen version moved in 5.x.x, find version for both 3.x.x and 5.x.x
EricaCMitchell
committed

Commits on Feb 3, 2026