- Add led_init() call during firmware initialization in app_main()
- Add led_stop_blink() call on WebSocket disconnect
- LED GPIO configurable via CONFIG_SPAXEL_LED_GPIO (default GPIO8)
- Blink runs in FreeRTOS task at ~5Hz (100ms on/100ms off)
- Any running blink is cancelled when new identify message received
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
