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ZephCore T096
4905191b1c
Ports the T096 "Option 1" design (single LED, get/set leds on|off persisted + get/set leds.brightness 0-100 RAM-only) to the Wireless Tracker V2, which has the same single-LED-multi-purpose situation (status_led doubles as heartbeat/message-flash/shutdown-flash/TX indicator, same as T096's P0.28). Adds a new ledc0 PWM channel on GPIO18 (same physical pin as the existing plain-GPIO status_led) with heartbeat-pwm-led/lora-tx-pwm-led aliases -- the shared C++ logic (helpers/ui/ui_common.c, adapters/board/ZephyrBoard.cpp, helpers/led_gate.c/h, helpers/CommonCLI.cpp) already existed from the T096 commits and needed no changes, being board-agnostic behind DT_NODE_EXISTS checks. CONFIG_PWM=y deliberately NOT in the board defconfig: WT2 builds via --sysbuild (mcuboot + app as two images sharing that defconfig), and mcuboot's minimal kernel config has no k_sem_give()/k_sem_take(), which the ESP32 PWM LED driver needs -- CONFIG_PWM=y there links the app image fine but fails mcuboot's link. New boards/common/esp32s3_pwm_led.conf scopes it to the app image only via EXTRA_CONF_FILE, alongside the existing esp32s3_usb.conf.