feat: prove Schur product theorem (IsPositiveDefinite.mul)#2
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Strengthen IsPositiveDefinite definition to require complex nonneg (both .re >= 0 AND .im = 0) matching standard probability theory references. Prove the Schur product theorem: pointwise product of PD functions is PD, via spectral decomposition of the PSD kernel matrix. New lemmas: re_nonneg, im_eq_zero, apply_zero_im, conj_neg, pdMatrix_posSemidef. Updates closure_pointwise and of_charFun for the strengthened definition.
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Summary
IsPositiveDefinitedefinition from.re >= 0to complex nonneg (real AND nonneg)mul) via spectral decomposition of PSD kernel matrixconj_neg), matrix bridge (pdMatrix_posSemidef), convenience accessorsclosure_pointwiseandof_charFunfor strengthened definitionSorry audit
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