Validate `features.utf8_validation` and `features.message_encoding`#596

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mcy wants to merge 26 commits intomainfrom

mcy/validate-misc-features

Commits on Sep 20, 2025

implement editions
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Commits on Sep 27, 2025

fix broken diagnostic
mcy
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Commits on Oct 1, 2025

Commits on Oct 7, 2025

Merge remote-tracking branch 'origin/main' into mcy/editions-validation
mcy
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Merge remote-tracking branch 'origin/main' into mcy/editions-validation
mcy
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