posix: options: add XSI_REALTIME_THREADS#96226

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Pancakem wants to merge 2 commits intozephyrproject-rtos:mainfrom

DevHeadsCommunity:posix-create-xsi-realtime-threads-option-group

Commits on Oct 13, 2025

doc: posix: mark XSI_REALTIME_THREADS as supported
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Commits on Oct 14, 2025

posix: options: add xsi realtime threads option group
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