Terminate evaluation subprocesses on timeout

[nikivanstein]

Summary

• run evaluation scripts with interruptible subprocesses and propagate timeout errors
• ensure problem evaluations clean up child interpreters when timeouts occur
• add regression coverage to confirm hung evaluations leave no stray run_eval.py processes

Testing

• uv run pytest tests/ (fails: missing optional test dependencies such as cloudpickle, numpy, httpx, matplotlib, mlflow, ioh)

[codecov]

Codecov Report

❌ Patch coverage is 80.00000% with 6 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
iohblade/problem.py	80.00%	6 Missing ⚠️

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