replace "context" macro usage with inline function calls

[gauravharsha]

Update all utils::context. call sites to utils::context(). following the replacement of the context preprocessor macro in green-utils with an inline function. Depends on Green-Phys/green-utils#5

[Copilot]

Pull request overview

This PR updates call sites to use the new utils::context() inline function (instead of the former utils::context macro/object) when checking MPI rank, aligning green-opt with the green-utils change referenced in Green-Phys/green-utils#5.

Changes:

• Replaced utils::context.global_rank with utils::context().global_rank in DIIS logging/debug output paths.
• Ensured all rank-gated output in diis_alg uses the updated context accessor.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.46%. Comparing base (4c4c51e) to head (30c9c1e).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main       #8   +/-   ##
=======================================
  Coverage   98.46%   98.46%           
=======================================
  Files           3        3           
  Lines         130      130           
=======================================
  Hits          128      128           
  Misses          2        2           

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