WIP: Add support for HyperHessian backend#940

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KristofferC wants to merge 7 commits intoJuliaDiff:mainfrom

KristofferC:kc/hyperhessians

Commits on Dec 3, 2025

WIP: Add support for HyperHessian backend
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only run HyperHessians tests
KristofferC
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less tests
KristofferC
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also have source for HyperHessians
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Commits on Dec 12, 2025

package is now registerd
KristofferC
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Commits on Dec 30, 2025

address review comments
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Commits on Jan 20, 2026

updates
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