ESP32-S3 firmware for forwarding keyboard and mouse input to another computer.

• Control path: host opens the board's COM/debug USB serial port and sends binary frames over UART0
• Target path: board exposes USB HID on the native OTG USB port
• Use case: hardware replacement for tools like DeskFlow where client software installation might not be possible
• Supports both absolute cursor position (for windowed/PiP setups) and standard relative cursor movements

Build-time variables:

• FIRMWARE_TARGET_SCREEN_WIDTH
• FIRMWARE_TARGET_SCREEN_HEIGHT
• FIRMWARE_USB_PRODUCT_NAME
• FIRMWARE_BAUD

Target screen dimensions are only needed for absolute cursor position.

Protocol details, packet layouts, field definitions, and frame examples are in docs/PROTOCOL.md.