Capture MPI_Iprobe errors

[aobolensk]

Summary

• handle return value from MPI_Iprobe in UnreadMessagesDetector

Testing

• pre-commit run --files modules/runners/src/runners.cpp

---

https://chatgpt.com/codex/tasks/task_e_686a6373e2bc832fbeae9af1495e0525

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.62%. Comparing base (1d7e7f8) to head (12ce2dc).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #526      +/-   ##
==========================================
+ Coverage   94.57%   94.62%   +0.05%     
==========================================
  Files          11       11              
  Lines         350      391      +41     
  Branches      117      141      +24     
==========================================
+ Hits          331      370      +39     
  Misses          5        5              
- Partials       14       16       +2     

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[github-actions]

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