Raise an error when simplex reaches max iterations - #15243
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Fixes #14584.
Tableau.run_simplex()now raises:ValueError: Simplex did not converge within N iterations. The problem may be cycling or unbounded.when the configured iteration limit is exhausted, instead of silently returning an empty dictionary. A regression test forces
maxiter=0and verifies the exact diagnostic.Tests:
python -m pytest tests/test_simplex.py -q(1 passed)python -m doctest linear_programming/simplex.pygit diff --check