fix(station-g3): expose FEM gain preferences

docs/cli_commands.md

@@ -291,6 +291,21 @@ This document provides an overview of CLI commands that can be sent to MeshCore
 
 ---
 
+#### View or change the LoRa FEM transmit-path gain state on supported boards
+**Usage:**
+- `get radio.fem.txgain`
+- `set radio.fem.txgain <state>`
+
+**Parameters:**
+- `state`: `on`|`off`
+
+**Notes:**
+- This controls a software-selectable external LoRa FEM transmit gain where the board supports it.
+- On Station G3, remove the PA PL1 jumper to allow software control. `on` selects PA PL1 high/short and `off` selects PA PL1 low/open. The PA PL2 hardware jumper determines whether this switches between power levels 1/3 or 2/4.
+- Select an operating level and SX1262 transmit power that comply with local RF limits and the Station G3 power-supply requirements.
+
+---
+
 ### System
 
 #### View or change this node's name