Fix NOMAD lower constraint bounds

[lowgame]

Summary

OptimizationNOMAD translated every nonlinear constraint as c(x) - ucons <= 0, so lower bounds were not passed to NOMAD. A lower-only constraint such as 1 <= x became x - Inf <= 0 and therefore accepted every finite value.

This change represents each interval constraint as:

max(lcons - c(x), c(x) - ucons) <= 0

That enforces both sides while preserving upper-only constraints and reducing equality constraints to an absolute residual.

Reproduction

The added regression minimizes x^2 with 1 <= x. Before the production change, NOMAD returned x = -0.0007, and the new assertion failed (4 passed, 1 failed). With the fix, it returns a value at the lower boundary and all Core tests pass.

Tests

• OPTIMIZATION_TEST_GROUP=Core julia --project=lib/OptimizationNOMAD -e 'using Pkg; Pkg.test()' — 5 passed
• OPTIMIZATION_TEST_GROUP=QA julia --project=lib/OptimizationNOMAD -e 'using Pkg; Pkg.test()' — 17 passed, 2 broken
• julia -e 'using Runic; exit(Runic.main(["--check", "lib/OptimizationNOMAD/src/OptimizationNOMAD.jl", "lib/OptimizationNOMAD/test/core_tests.jl"]))' — passed
• git diff --check — passed