…mits>

This header declares PeriodIndexNeighbors as int8_t but relied on indirect includes for the type.
Add an explicit #include <cstdint> to ensure portability across compilers and platforms
(MSVC/Clang/GCC), and deduplicate a repeated <limits> include. No functional/runtime changes;
this is a safe, hygiene-only fix that reduces the risk of build failures in strict toolchains
and keeps the header self-contained.

- Touches: Common/include/geometry/primal_grid/CPrimalGrid.hpp
- Behavior change: none
- Risk: low; header-only; does not affect algorithms, IO, or numerics

Signed-off-by: Shubham shukla
<shubhushukl586@gmail.com>