Add PPCG diagonalization method with Polak-Ribiere conjugate gradient#7434
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Add Projected Preconditioned Conjugate Gradient (PPCG) method using Polak-Ribiere beta formula for conjugate direction mixing, with explicit projection to maintain orthogonality against eigenvectors.
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Summary
Add PPCG (Projected Preconditioned Conjugate Gradient) diagonalization method to hsolver module.
Changes
diago_ppcg.h— PPCG class declaration with Polak-Ribiere beta mixingdiago_ppcg.cpp— PPCG implementation: preconditioned conjugate gradient with explicit projection, Cholesky orthonormalization, and line minimizationsource_hsolver/CMakeLists.txt— Register diago_ppcg.cpp in buildPPCG vs BPCG
Test plan