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- Add 'clear' and 'cls' builtin handlers in LazyBox shell - Output ANSI \033[2J\033[H sequence on tty_clear() to clear serial/UART terminals - Support both ASCII 0x7F (DEL) and 0x08 (BS) for Backspace in shell and nano editor - Connect 16550 serial input to keyboard_get_key() on x86_64 for headless terminals - Add ANSI escape sequence decoding for arrow keys (Up/Down/Left/Right/Home/End/Del) - Update Makefile 'make run' and 'make qemu' with -display none for smooth terminal execution - Add 'make run-gui' target for optional graphical SDL/GTK window