Mpi collective - #1
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This commit enables testing by setting ENABLE_TESTING to ON in CMakeLists.txt. It includes the <cinttypes> header in mpi_types.h and updates the handling of CRAY-C compilers by adding conditional compilation checks. Additionally, it refines type casting and constexpr definitions for improved code clarity and performance.
Replace collective-shaped pairwise traffic with checked dense and neighborhood collectives, preserve deterministic partition semantics and asynchronous evolutionary gossip, and fail fast on MPI errors. Adopt CMake 4 object targets and file sets, C++23 dependencies and vcpkg presets, plus deterministic correctness, install, sanitizer, MPI capability, and performance verification.
Use private stream-based fatal diagnostics and explicit tuple-based MPI schemas without changing installed public interfaces. Add a locked devenv environment with multiverse MPICH 4.3.2 and a CMake 4 baseline. Preserve the existing CI Catch2 path and improve zero-degree MPI and macOS failure-probe portability. Validated with 112 focused MPI and consumer checks, four serial consumer checks, and GCC 14 and Clang 19 builds on Cirrus.
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