build(solo): drop the L2 bring-up and Arduino 2.0.17 envs

Neither is published or used any more: the LVGL firmware on Arduino-ESP32
3.x is the only L2 build.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

examples/companion_radio/ui-lvgl/OtaScreen.h

@@ -6,8 +6,8 @@
 // the idle OTA slot; the device then restarts into it. Settings, contacts and
 // messages live outside the app slots and are kept.
 //
-// Needs Arduino-ESP32 3.x for the CA bundle: the 2.0.17 build and the sim say
-// so instead of offering the update.
+// Needs Arduino-ESP32 3.x for the CA bundle: the sim says so instead of
+// offering the update.
 //
 // Single-TU fragment: included at the end of ui-lvgl/UITask.cpp.
 

solo/wio-tracker-l2/platformio.ini

@@ -2,40 +2,6 @@
 ; variants/wio-tracker-l2/platformio.ini. Solo configs live in their own
 ; top-level solo/ folder, separate from the shared upstream board variants.
 ;
-; BRING-UP ONLY: this env runs the existing ui-new (OLED-era, joystick-driven)
-; UI zoomed 2x (160x120 logical on the 320x240 panel) purely to compile-test
-; and smoke-test the board layer -- display, radio, GPS, battery. It has no
-; touch input yet; the only control is the BOOT button. The real interface for
-; this board is the planned LVGL frontend over a shared UI Core.
-;
-; Deliberately NOT named *_solo_dual yet, so build-solo-firmwares.yml doesn't
-; publish it as a release artifact.
-[env:Wio_Tracker_L2_companion_solo_bringup]
-extends = Wio_Tracker_L2
-build_flags =
-  ${Wio_Tracker_L2.build_flags}
-  -I examples/companion_radio/ui-new
-  -D DISPLAY_CLASS=WioTrackerL2Display
-  -D UI_ZOOM=2
-  -D MAX_CONTACTS=350
-  -D MAX_GROUP_CHANNELS=40
-  -D BLE_PIN_CODE=123456
-  -D DUAL_SERIAL=1
-  -D OFFLINE_QUEUE_SIZE=256
-  -D FIRMWARE_SOLO_BUILD=1
-  -D MESHCORE_VERSION='"1.17.1"'
-  -D OLED_MISC_FIXED_FONT=1
-  -D AUTO_OFF_MILLIS=60000
-build_src_filter = ${Wio_Tracker_L2.build_src_filter}
-  +<helpers/esp32/*.cpp>
-  +<helpers/ui/LGFXDisplay.cpp>
-  +<helpers/ui/MomentaryButton.cpp>
-  +<../examples/companion_radio/*.cpp>
-  +<../examples/companion_radio/ui-new/*.cpp>
-lib_deps =
-  ${Wio_Tracker_L2.lib_deps}
-  densaugeo/base64 @ ~1.4.0
-
 ; ui-lvgl: the real L2 interface -- LVGL 9 frontend over the shared UI Core
 ; (docs/solo/developer/ui-core.md, step 5), on Arduino-ESP32 3.3.12 / ESP-IDF 5.5
 ; (pioarduino). *_solo_lvgl envs are published by build-solo-firmwares.yml
@@ -106,26 +72,6 @@ lib_deps =
   Update              ; Settings > Firmware update
   LittleFS
 
-; The same firmware on the old Arduino-ESP32 2.0.17 (ESP-IDF 4.4), kept for
-; comparison while the 3.x one settles. Not published (the name doesn't end in
-; _solo_lvgl) and can't update itself (no CA bundle for the TLS check).
-[env:Wio_Tracker_L2_companion_solo_lvgl_arduino2]
-extends = env:Wio_Tracker_L2_companion_solo_lvgl
-platform = ${esp32_base.platform}
-build_unflags = -DARDUINO_USB_MODE=1 -DUI_FLUSH_DMA   ; DMA flush untried on ESP-IDF 4.4
-lib_deps =
-  ${Wio_Tracker_L2.lib_deps}
-  densaugeo/base64 @ ~1.4.0
-  lvgl/lvgl @ 9.6.0
-  bitbank2/PNGdec @ 1.1.6
-  SD_MMC
-  FS
-  WiFi
-  HTTPClient
-  WiFiClientSecure
-  Preferences
-  LittleFS
-
 ; Rebuilds the framework libs (ESP-IDF) with the custom_sdkconfig above; the
 ; firmware env above then links them. Run once before it, and again after a
 ; custom_sdkconfig change (pio run -e Wio_Tracker_L2_idf_libs). Needed because