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* stm32wl(rak3172): implement cpuDeepSleep()/shutdown() via STM32LowPower cpuDeepSleep() was an empty stub, so the SDS deep-sleep PowerFSM state and low-battery shutdown did nothing but leave the CPU running at full power. Power::shutdown() also didn't include STM32WL in its arch list, so an explicit shutdown command just logged a FIXME warning. Adds STM32LowPower as a lib_dep (rak3172 only, mirroring STM32RTC) and implements cpuDeepSleep() using it. Standby mode is used for both the finite-wake (SDS/low battery) and forever (shutdown) paths, via LowPower.shutdown(), with or without an RTC alarm. If the LSE-backed hardware RTC never came up (stm32wlRtcAvailable() false), this is a no-op - safer than sleeping without a confirmed wake source. LowPower.shutdown() resets the MCU on wake and should never return; if it somehow does, force a reset via HAL_NVIC_SystemReset() rather than hanging the device silently forever. Gated behind the existing HAS_LSE flag, so this is inert on every variant but rak3172. Assisted-by: Claude Sonnet 5 <noreply@anthropic.com> Signed-off-by: Andrew Yong <me@ndoo.sg> * feat(stm32wl): Warn and reset when trying to deepSleep without RTC This is to prevent leaving the firmware catanonic when firmware has run its shutdown routine but doesn't actually shutdown. Signed-off-by: Andrew Yong <me@ndoo.sg> --------- Signed-off-by: Andrew Yong <me@ndoo.sg>