Fix undefined MAX_RESULTS in test_design_builder.py

[Copilot]

The test file referenced MAX_RESULTS without defining it, causing NameError on test execution.

Changes:

• Added MAX_RESULTS = 5 module-level constant in tests/test_design_builder.py

"""Tests for PyOpenMagnetics Design Builder API."""

import pytest
import math

# Maximum number of results to request in solve() calls for testing
MAX_RESULTS = 5

The constant is used in test methods like:

def test_solve_flyback(self):
    results = Design.flyback().vin_ac(85, 265).output(12, 5).fsw(100e3).solve(max_results=MAX_RESULTS)
    assert isinstance(results, list)

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