Registers the UMFPACK sparse half at program start when the host has SuiteSparse, mirroring the CBLAS backend's cblasAutoInstall and the JVM's ServiceLoader discovery.

Separate from the CBLAS registration because the two libraries are independent: a host may have OpenBLAS without SuiteSparse or the reverse, and each half should accelerate on its own. Nothing is registered when the library is absent, and koblas stays on the portable SparseLu.

No probe computation runs here, unlike the CBLAS auto-install. Resolution has already checked that the library opens and carries umfpack_di_symbolic, and a probe factorization would be real work inside program startup for a backend whose factor falls back on any failure anyway.

If the linker drops this unreferenced property, installBackends(koblas.with(sparseLapack = ...)) remains the explicit path.