Cherrypick PR #47: Fix cad_mesh_grading_factor to accept float values and remove GradingFactor enum

[Copilot]

Description

Cherrypicks changes from PR #47 (merged to release/26) into main. The cad_mesh_grading_factor property incorrectly used a GradingFactor enum restricting values to SLOW=0 and FAST=1. The underlying COM API accepts double from 0.0 to 1.0 for continuous mesh transition control.

Changes:

• Removed GradingFactor enum from common.py and __init__.py
• Updated cad_mesh_grading_factor setter to accept float with range validation [0, 1]
• Updated tests to use float values (0.0, 0.5, 1.0) instead of enum
• Deleted grading_factor.rst documentation
• Updated CHANGELOG.md with breaking change

Before:

from moldflow import MeshGenerator, GradingFactor

mesh_gen.cad_mesh_grading_factor = GradingFactor.SLOW  # Only 0 or 1

After:

from moldflow import MeshGenerator

mesh_gen.cad_mesh_grading_factor = 0.0   # slow transition
mesh_gen.cad_mesh_grading_factor = 0.5   # medium transition
mesh_gen.cad_mesh_grading_factor = 1.0   # fast transition

Type of change

• Bug fix (non-breaking change which fixes an issue)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

• I have read the CONTRIBUTING document
• My code follows the style guidelines of this project
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have updated the documentation accordingly
• I have added a note to CHANGELOG.md describing my changes
• My changes generate no new warnings
• Any dependent changes have been merged and published

Testing

Tests validate float range and type checking:

# Valid float values in range [0, 1]
@pytest.mark.parametrize("value", [0.0, 0.5, 1.0])
def test_cad_mesh_grading_factor_valid(mock_mesh_generator, value):
    mock_mesh_generator.cad_mesh_grading_factor = value
    assert mock_mesh_generator.cad_mesh_grading_factor == value

# Invalid types
@pytest.mark.parametrize("value", ["abc", True, None])
def test_cad_mesh_grading_factor_invalid_type(mock_mesh_generator, value):
    with pytest.raises(TypeError):
        mock_mesh_generator.cad_mesh_grading_factor = value

Additional Notes

Breaking Change: Code using GradingFactor.SLOW or GradingFactor.FAST must update to 0.0 or 1.0. Enum imports will fail.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>[BUG] Cherrypick changes from PR #47 into the main branch</issue_title>
<issue_description>Describe the bug
The fix in #47 for release/26 needs to brought into the main branch.

Additional context
Add any other context about the problem here.
</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes [BUG] Cherrypick changes from PR #47 into the main branch #52

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