Integrate W12 RF switching and LR2021 receive PRs

Adapt upstream MeshCore #3579 at 7457cff43c22697119e06ad7d192a37de0990403:
retain GC1109 LF standby bias, with checked cold controls before band supply
changes and shutdown. Preserve exclusive LF/HF rails and TX error cleanup.
Reset before boot rail changes and before SPI-dependent hard recovery.

Retain our stronger implementation of #3512 at
d208bfef94ab83280de30ba4a0675ff73b3ecef3. Add regressions for suspect FIFO
contents, failed RX_DONE acknowledgement, and fresh preamble timing.
W12 TX power defaults from #3319 were already included via 65aa1138a.

Validation: 79 targeted native tests; canonical W12 Full repeater and Full
Companion builds, capability checks, app-size and RAM checks passed.
Physical W12 RF envelope, current and LoRa management confirmation remain.

Upstream PRs:
https://github.com/meshcore-dev/MeshCore/pull/3579
https://github.com/meshcore-dev/MeshCore/pull/3512
https://github.com/meshcore-dev/MeshCore/pull/3319

.github/workflows/run-unit-tests.yml

@@ -129,10 +129,10 @@ jobs:
           bash build.sh build-firmware Station_G3_ESP32_r2_repeater_observer_mqtt
           --firmware-version v1.18.0.1-halo-keymind-cascade-dev
           --radio-preset usa-cascade-fixed --profile cascade --require-ota --full-exact
-      - name: Compile W12 low-power FEM TX preparation in repeater and Full Companion
+      - name: Compile W12 band-aware RF switching in repeater and Full Companion
         run: |
           pio run -e meshnology_w12_repeater
-          bash build.sh build-firmware meshnology_w12_companion_radio_full --firmware-version v1.17.1.10-halo-keymind-cascade-dev --radio-preset usa-cascade-fixed --profile cascade --require-ota
+          bash build.sh build-firmware meshnology_w12_companion_radio_full --firmware-version v1.18.0.1-halo-keymind-cascade-dev --radio-preset usa-cascade-fixed --profile cascade --require-ota
       - name: Show qualification build logs on failure
         if: failure()
         run: |