Add RAK WisMesh Pod variant and fix Tag LPCOMP wake on user shutdown (#11049)

* Add RAK WisMesh Pod variant and fix Tag LPCOMP wake on user shutdown

* chore: trunk fmt - replace Unicode em-dash in Pod comment

Co-authored-by: Cursor <cursoragent@cursor.com>

---------

Co-authored-by: Ben Meadors <benmmeadors@gmail.com>
Co-authored-by: Cursor <cursoragent@cursor.com>

variants/nrf52840/rak_wismeshtag/platformio.ini

@@ -23,3 +23,11 @@ build_flags = ${nrf52840_base.build_flags}
   -DRADIOLIB_EXCLUDE_LR2021=1
   -DMESHTASTIC_EXCLUDE_WIFI=1
 build_src_filter = ${nrf52_base.build_src_filter} +<../variants/nrf52840/rak_wismeshtag>
+
+; RAK WisMesh Pod - same board as Tag (no user buttons on hardware; shares Tag pin map)
+[env:rak_wismesh_pod]
+extends = env:rak_wismeshtag
+custom_meshtastic_display_name = RAK WisMesh Pod
+build_flags =
+  ${env:rak_wismeshtag.build_flags}
+  -D WISMESH_POD

variants/nrf52840/rak_wismeshtag/variant.cpp

@@ -46,6 +46,14 @@ void initVariant()
 }
 
 #ifdef LOW_VDD_SYSTEMOFF_DELAY_MS
+static bool lowVddSystemOff = false; // Set when brownout forces System OFF (enables LPCOMP wake).
+
+// Strong override; must be noinline (see main-nrf52.cpp weak default).
+__attribute__((noinline)) bool variant_enableBatteryLpcompWake()
+{
+    return lowVddSystemOff;
+}
+
 void variant_nrf52LoopHook(void)
 {
     // If VDD stays unsafe for a while (brownout), force System OFF.
@@ -72,6 +80,7 @@ void variant_nrf52LoopHook(void)
                 low_vdd_timer_armed = true;
             }
             if ((uint32_t)(now - low_vdd_since_ms) >= (uint32_t)LOW_VDD_SYSTEMOFF_DELAY_MS) {
+                lowVddSystemOff = true;
                 cpuDeepSleep(portMAX_DELAY);
             }
         } else {

variants/nrf52840/rak_wismeshtag/variant.h

@@ -55,10 +55,13 @@ extern "C" {
 /*
  * Buttons
  */
-
+#ifndef WISMESH_POD
 #define PIN_BUTTON1 9 // Pin for button on E-ink button module or IO expansion
 #define BUTTON_NEED_PULLUP
 #define PIN_BUTTON2 12
+#else
+#define HAS_BUTTON 0
+#endif
 
 /*
  * Analog pins