Fix 8 HPC-sensitive bugs: GPU kernels, MPI broadcast, domain decomposition#1242

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Commits on Feb 24, 2026

Fix z-boundary backward FD stencil using fields(2) instead of fields(3)

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Fix bc_x%ve3 never MPI-broadcast (duplicate ve2 instead)

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Fix fluid_rho broadcast using MPI_LOGICAL instead of mpi_p

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Fix loc_violations used uninitialized in MPI_Allreduce

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Fix loc_violations gaining implicit SAVE attribute

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Fix GRCBC subsonic inflow using wrong L index

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Fix G_K exponential degradation in damage model

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Fix domain decomposition overwriting muscl_order

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Fix NaN check reading wrong index in MPI unpack

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Replace error stop with s_mpi_abort in NaN diagnostic

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