Merge upstream companion-v1.17.0 (CAD) into power-saving

Adopts hardware Channel Activity Detection (wired into
RadioLibWrapper::isChannelActive() alongside our RSSI-threshold check
and RX duty-cycle power-save), MCU temperature telemetry, LR2021
standby workaround, DISPLAY_SCALE/FLIP overrides, NRF52Board
shutdownPeripherals() refactor, and misc upstream fixes.

Declines upstream's ConfigSerializer-based NodePrefs rewrite,
MultiSerialInterface/interface_manager, and UIColor palette system —
each would have broken large parts of the Solo-specific feature set
(NodePrefs fields, per-variant single serial_interface, enum-based
DisplayDriver::Color). Flagged as candidate follow-up migrations, not
permanent no's.

Also fixes several pre-existing bugs surfaced while chasing silent
merge breaks (stale newMsg() override signature in ui-tiny/ui-orig,
dead UIEventType::newContactMessage case, missing ContactsIterator
init), bumps FIRMWARE_VERSION/MESHCORE_VERSION to 1.17, and fixes a
missing <cstdlib> include that broke the native ConfigSerializer unit
tests.

Verified via 13+ pio run builds across ESP32/nRF52, all 3 companion UI
variants, and 7 display drivers, plus the full native unit test suite
(33/33 passing).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

.github/workflows/pr-build-check.yml

@@ -34,8 +34,11 @@ jobs:
           - Heltec_v3_room_server
           # nRF52
           - RAK_4631_companion_radio_ble
+          - RAK_4631_companion_radio_ethernet
           - RAK_4631_repeater
+          - RAK_4631_repeater_ethernet
           - RAK_4631_room_server
+          - RAK_4631_room_server_ethernet
           # RP2040
           - PicoW_repeater
           # STM32

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

@@ -20,7 +20,7 @@ jobs:
         uses: ./.github/actions/setup-build-environment
 
       - name: Run Unit Tests
-        run: pio test -e native -vv
+        run: pio test -e native -e native_kiss_modem -vv
 
       - name: Upload Test Results
         # Upload test results even if the test step failed.