Improve thread safety of `ENV` on UNIX#16448

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ysbaddaden wants to merge 4 commits intocrystal-lang:masterfrom

ysbaddaden:feature/add-thread-safety-to-env

Commits on Nov 28, 2025

Commits on Dec 8, 2025

Merge branch 'master' into feature/add-thread-safety-to-env
ysbaddaden
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