Add scalar and block Lanczos matrix-function application - #191
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This was referenced Oct 1, 2026
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LanczosFAandBlockLanczosFAapproximatef(A)Bfrom matrix products with a symmetric operator. The scalar implementation processes right-hand sides independently; the block implementation builds a shared Krylov basis. Both support fixed-depth evaluation and reusable workspaces.This extracts the matrix-function application components from #138, based on #190. It includes the shared workspace helpers and a dense eigendecomposition oracle for tests. Optional CGS2 reorthogonalization is in #195.
Validation. All 508 core Release tests passed locally with Spack Clang 19.1.3 on macOS. Component tests compare against independently evaluated dense matrix functions, including full-depth recovery. Driver integration remains in #138.