Fix threading issue of `Atlas.FallbackStack`, and introduce overloads with `fallback` parameter#1089

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Saplonily wants to merge 3 commits intoEverestAPI:devfrom

Saplonily:fallback-stack-fix

Commits on Mar 20, 2026

Revert "change Atlas.FallbackStack to ConcurrentStack"
Saplonily
committed
Change `Atlas.FallbackStack` to `ThreadLocal<T>`
Saplonily
committed
Mark FallbackStack operations as obsolete and introduce overloads with fallback parameter
Saplonily
committed