feat(power): add controlled low-battery shutdown

components/control_plane/include/control_plane.h

@@ -130,6 +130,12 @@ esp_err_t control_plane_init(void);
  */
 esp_err_t control_plane_battery_service_start(void);
 
+/**
+ * Re-enter deep sleep before normal boot when a low-battery wake has not
+ * recovered and no charger is active.
+ */
+esp_err_t control_plane_battery_apply_boot_guard(void);
+
 /**
  * @brief Prepare platform-backed persistent storage before runtime workers start.
  *