feat: GPU ops for Grassmann, Sphere, Euclidean, UnitaryMatrices, SPD (PR #856 port)#1

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zazabap wants to merge 7 commits intoJuliaManifolds:mainfrom

Commits on Mar 5, 2026

test: add JLArray CI-safe tests, restructure test runner

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test: fix test quality issues (seed, is_point, tolerances, compat)

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feat: GPU Grassmann exp! and polar retraction (PowerManifold batch)

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feat: GPU exp! and log! for PowerManifold(Sphere)

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feat: GPU exp! and log! for PowerManifold(Euclidean)

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feat: GPU exp! for PowerManifold(UnitaryMatrices), complex matrix exponential

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feat: GPU-assisted exp! for PowerManifold(SymmetricPositiveDefinite)

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