Allow deletion of frozen fields

[Glinte]

Summary

• support deleting frozen fields by implementing FrozenField.__delete__
• test that removing a frozen field raises AttributeError on later access

Testing

• python -m ruff check semimutable/__init__.py tests/test_semimutable_dataclass.py
• python -m ruff format semimutable/__init__.py tests/test_semimutable_dataclass.py
• pytest

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https://chatgpt.com/codex/tasks/task_e_68958e5da25883229d6b1884b08b4ffd

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 80.00000% with 2 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
semimutable/__init__.py	80.00%	2 Missing ⚠️
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Files with missing lines	Coverage Δ
semimutable/__init__.py	85.50% <80.00%> (-0.44%)	⬇️

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