Make readability-function-cognitive-complexity threshold more strict

[aobolensk]

Functions with scores beyond 15 are typically flagged as potentially problematic. Empirical evidence suggests that such functions are more likely to correlate with higher error rates or maintenance challenges. It becomes increasingly hard for developers to follow the control flow, and these functions are prime candidates for refactoring into simpler, more modular parts.

[Copilot]

Copilot reviewed 1 out of 2 changed files in this pull request and generated 1 comment.

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• tasks/mpi/example/src/ops_mpi.cpp: Language not supported

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.50%. Comparing base (7e9c38d) to head (7b9ac0a).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #365      +/-   ##
==========================================
+ Coverage   95.47%   96.50%   +1.03%     
==========================================
  Files          26       26              
  Lines         486      487       +1     
  Branches      145      143       -2     
==========================================
+ Hits          464      470       +6     
+ Misses          9        5       -4     
+ Partials       13       12       -1     

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