Merge upstream dev through 5846fa19

Import Airoha GPS RTC backup sleep, 24 contact search results, and the T-Echo Lite USB companion target. Preserve existing GPS telemetry and power-saving controls, crypto alignment checks, ESP32 RTC recovery, and RAK11310 dynamic-preference compatibility.

Validate GPS sleep acknowledgments with their NMEA checksum and add six native regression tests covering retry, drain, corruption, grace timeout, and timer rollover.

Verified: 1648 native and KISS modem tests; targeted nRF52, companion routing, one-key DM, and clock checks; T1000-E BLE, MeshTracker X1 USB, and T-Echo Lite USB companion builds.

examples/simple_sensor/SensorMesh.h

@@ -47,7 +47,7 @@
 
 #define FIRMWARE_ROLE "sensor"
 
-#define MAX_SEARCH_RESULTS      8
+#define MAX_SEARCH_RESULTS     24
 #define MAX_CONCURRENT_ALERTS   4
 
 class SensorMesh : public mesh::Mesh, public CommonCLICallbacks,