* **PXE boot configuration**: Add `dnsmasq.conf` to configure PXE boot, set TFTP root directory, and configure DHCP options.
* **PXE bootloader configuration**: Add `pxelinux.cfg/default` to configure the PXE bootloader and set the bootloader to point to the macOS KVM kernel/initrd.
* **Serve PXE boot files**: Add `serve_pxe.sh` script to serve `pxelinux.0`, `vmlinuz`, and `initrd` via TFTP using `dnsmasq`.
* **Retrieve internal IP**: Add `get_internal_ip.sh` script to retrieve the internal IP address of the Codespace.
* **Update boot script**: Modify `boot-macOS-headless.sh` to use the PXE boot files from the `netboot` directory and add a network boot option to the QEMU command.
CHUCK