Merge upstream companion-v1.17.1 into power-saving

Pulls in real fixes: scoped-reply routing, RX boosted-gain restored
correctly after AGC reset, T-Echo Lite/Card SPI pin corrections
(unused pins now map to NRFX_SPIM_PIN_NOT_USED via 0 instead of -1)
and TCXO voltage fix, Heltec T096/T1 and MeshPocket pin fixes,
T-beam Supreme S3 display fix, LR2021 preamble/IRQ timeout handling.

None of the touched variants overlap with our active Heltec V3/V4,
Cardputer ADV, GAT562, or WioTracker builds.

# Conflicts:
#	examples/companion_radio/MyMesh.cpp
#	examples/companion_radio/MyMesh.h
#	examples/companion_radio/NodePrefs.h
#	src/helpers/radiolib/CustomSX1262Wrapper.h
#	src/helpers/radiolib/RadioLibWrappers.cpp
#	src/helpers/ui/SH1106Display.cpp
#	variants/lilygo_techo_lite/platformio.ini
#	variants/lilygo_techo_lite/variant.h

docs/cli_commands.md

@@ -291,6 +291,22 @@ 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.
+- The setting is saved immediately, but on Station G3 the level is applied to the hardware at the start of the next transmit, so that the PA supply rail is never re-targeted while the PA is being driven. `get` reports the configured state, which may lead the hardware until the node next transmits.
+
+---
+
 ### System
 
 #### View or change this node's name