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Summary

Remove the unmaintained pytest-mpi dependency while preserving the existing MPI workflow. Use standard pytest hooks instead of pytest-isolate-mpi, whose unconditional MPI-launcher requirement conflicts with serial-only test environments.

Changes

• Dependencies: Remove the plugin dependency and requirement; refresh both lockfiles.
• Compatibility: Preserve --with-mpi, minimum-rank markers, VS Code activation, and rank-zero reporting. Existing MPI and coverage recipes remain unchanged.

Checklist

• Add 15 focused regression cases covering selection, rank requirements, and reporting.
• Document the plugin-free MPI setup.

AI/LLM disclosure

• GitHub Copilot helped generate the implementation, tests, and this description.

• Fixes Remove pytest-mpi which is no longer actively maintained #414

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[github-actions]

Docs preview: https://pr-415.monoprop-docs.pages.dev

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.99%. Comparing base (794f239) to head (deb1865).
⚠️ Report is 2 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #415   +/-   ##
=======================================
  Coverage   97.99%   97.99%           
=======================================
  Files          14       14           
  Lines         797      797           
  Branches      111      111           
=======================================
  Hits          781      781           
  Misses         11       11           
  Partials        5        5           

Flag	Coverage Δ
cpp	97.99% <ø> (ø)

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud