Skip InitVar fields when freezing

[Glinte]

Summary

• avoid freezing InitVar fields when applying descriptors
• test that frozen InitVar parameters vanish after initialization

Testing

• pytest

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https://chatgpt.com/codex/tasks/task_e_68958e5e6e3c8322afe648ab0ede4aa9

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
semimutable/__init__.py	33.33%	1 Missing and 1 partial ⚠️
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Files with missing lines	Coverage Δ
semimutable/__init__.py	84.61% <33.33%> (-1.33%)	⬇️

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