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Adds optional
portable-atomicsupport totrussed-corefor targets without native atomic CAS, including Cortex-M0/M0+ (RP2040) and RISC-VInterruptFlagandResetSignalAllocationcurrently useAtomicU8::compare_exchangewhich isn't available on these targetsThe new feature switches both to
portable_atomic::AtomicU8using an interrupt-based fallback on bare-metal ARM/RISC-V without requiring acritical-sectionimplementationDefault builds remain unchanged, and targets with native CAS continue using it