Fix erofs build failures from incomplete file_contexts entries#44

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Copilot wants to merge 7 commits intosixteenfrom

copilot/fix-erofs-build-error

Commits on Dec 31, 2025

Initial plan
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Fix file_contexts validation and add default SELinux contexts

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EduardoA3677
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Simplify case statement and improve comment clarity

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EduardoA3677
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Improve awk script readability and robustness

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EduardoA3677
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Explicitly skip empty lines in file_contexts validation

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EduardoA3677
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Handle comments and improve first valid line extraction

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EduardoA3677
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Use consistent comment detection pattern in both awk scripts

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EduardoA3677
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