Align ExpEig input semantics with LogEig outputs#8
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Remove redundant upper-vectorized validation (vec_to_sym handles it), use math.isqrt and einops.rearrange for the flatten branch.
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Summary
ExpEigto decode vectorized tangent inputs (upperandflatten) before applying matrix exponentialExpEigalways return SPD matrices with shape(..., n, n)ValueErrormessages for invalid vector lengths and non-square matricesValidation