feat: add ESP32 lcgamboa test suite, sketches and firmware binaries
- test/esp32/test_esp32_lib_bridge.py: 28-test suite for ESP32 emulation
via libqemu-xtensa.dll (GPIO, UART, ADC, pinmap, DLL symbols, manager API)
- test/esp32/test_arduino_esp32_integration.py: 13-test integration suite
simulating Arduino Uno ↔ ESP32 serial communication (LED_ON/OFF, PING/PONG,
GPIO transitions, rapid burst, unknown command resilience)
- sketches/blink_lcgamboa/: IRAM/DRAM-safe blink firmware (5× GPIO2 toggle)
- sketches/serial_led/: ESP32 firmware responding to serial commands over UART0
- sketches/arduino_serial_controller/: Arduino Uno sketch for serial LED control
- sketches/blink_qemu.ino: reference blink sketch for stock QEMU
- binaries_lcgamboa/: pre-compiled 4 MB merged flash images for QEMU
(blink_lcgamboa + serial_led, arduino-esp32 2.0.17 + FlashMode=dio)
- .gitignore: exclude DLL/ROM binaries (too large) and .elf/.map build artifacts
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
b166b8de37