fix: reject workers=0 and negative values with clear error (#39938)#39940

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Vitalcheffe wants to merge 3 commits intomicrosoft:mainfrom

Vitalcheffe:fix/workers-zero-validation-39938

Commits on Mar 30, 2026

fix: reject workers=0 and negative values with clear error message
Vitalcheffe
committed

Commits on Mar 31, 2026

test: add workers validation tests for 0, negative, and CLI values
Vitalcheffe
committed
fix: match actual error messages in worker validation tests
Vitalcheffe
committed