Add ThreadSanitizer CI jobs (Linux + macOS)#148

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bghgary wants to merge 8 commits intoBabylonJS:mainfrom

bghgary:feature/thread-sanitizer

Commits on Apr 16, 2026

Add ThreadSanitizer (TSan) support and CI job

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Add Tests/UnitTests/dist/ to .gitignore

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Add TSan support for macOS, note Windows not supported

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Temporarily point arcana.cpp and UrlLib at fork branches for TSan testing

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Add TSan suppression file for JSC-internal races, update deps

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Fix TSan suppressions: use called_from_lib for JSC allocator races

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Update UrlLib fork SHA to include review fixes

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Update UrlLib fork SHA to include open/closeCb fixes

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