Merge PR #7 with reviewed ExpressLRS power and memory fixes

Integrate ExpressLRS TX module support and its stacked ESP32 heap changes.
Use the approved Linkflow calibration (17-30 dBm), preserve the PA drive
and output path after radio recovery, and keep LoRa OTA enabled.

Preserve stored ACLs and filters on allocation failure, release owned
client/filter buffers, service heap OTA contexts on Companions, release
self-serving workspaces after TempRadio, and reset staged-resume state
when a context is released. Keep manual staging and active operations
alive. Account for all moved allocations in the runtime RAM gate.

Validation: 1,393 native cases; radio-power, heap-context, ACL persistence,
shared-queue transfer, display/inbox, radio receive, and memory regressions.
Firmware builds passed for Linkflow, Heltec V2 Companion, T-Beam MQTT
repeater, Heltec V4 R8 MQTT repeater, RAK4631 repeater, and Indicator Full.
Physical verification awaits access to the currently offline lab Pi.

examples/simple_sensor/SensorMesh.cpp

@@ -6,6 +6,9 @@
 #include <helpers/LazyPersistence.h>
 #include <helpers/radiolib/RXPowerSaving.h>
 #include <helpers/UsbLogging.h>
+#if defined(ENABLE_OTA)
+#include <helpers/ota/OtaContext.h>
+#endif
 
 static uint32_t nextRadioApplyRetryDelay(uint8_t& failure_count) {
   uint8_t shift = failure_count < 5 ? failure_count : 5;
@@ -1358,6 +1361,9 @@ void SensorMesh::loop() {
           (unsigned long)retry_delay);
     }
   }
+#if defined(ENABLE_OTA) && OTA_DYNAMIC_CONTEXT
+  mesh::ota::ota_service_temp_radio_context(isTempRadioActive());
+#endif
 }
 
 bool SensorMesh::isMillisTimerDue(unsigned long timestamp) const {