GitLab

Use explicit 128-thread block launches for selected HIP PME kernels that
benefit from larger blocks.  Keep the platform default block size unchanged,
and leave small-system grid indexing and charge spreading on the existing
default launch configuration.

The heuristic applies 128-thread launches to finishSpreadCharge on HIP, and
uses 128-thread launches for findAtomGridIndex and gridSpreadCharge only for
larger systems.  Coulomb PME and LJPME dispersion paths are handled in
parallel, while interpolation and energy evaluation remain unchanged.