replace "context" macro with inline function

[gauravharsha]

Replace #define context mpi_context::context() in mpi_shared.h with a proper inline function inline mpi_context& context(). The macro was leaking into downstream translation units and conflicting with the context identifier from newer versions of h5pp.

[Copilot]

Pull request overview

This PR removes a preprocessor macro (context) from mpi_shared.h—which leaked into downstream translation units and could rewrite unrelated identifiers—and replaces it with a namespaced inline accessor function to avoid collisions (notably with newer h5pp).

Changes:

• Removed #define context mpi_context::context() from src/green/utils/mpi_shared.h.
• Added green::utils::context() inline function returning mpi_context::context().

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 71.09%. Comparing base (c6f8b5b) to head (bbd4270).

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #5      +/-   ##
==========================================
+ Coverage   70.95%   71.09%   +0.13%     
==========================================
  Files           3        4       +1     
  Lines         210      211       +1     
==========================================
+ Hits          149      150       +1     
  Misses         61       61              

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