EN10/TinyBoxLinux — reverse-engineered prompt

Build me a super tiny educational Linux distro from scratch, something around 3 to 4 MB total, using a very minimal Linux kernel and ToyBox for the user space. I want it to boot in QEMU on x86_64 either from a kernel plus initramfs pair or from a small ISO, and drop me into a working shell with the usual tiny Unix commands.

Please make sure networking works, including DHCP and DNS, and keep the kernel config as stripped down as possible while still being usable. I’d also like simple scripts and short docs so I can rebuild the kernel, refresh the root filesystem, create the bootable ISO, and run the prebuilt images easily, including basic Windows friendly QEMU instructions. If there are helper scripts for setup, cross compiling, or adding a few extra packages, wire those up in a clean way too.

Look up current docs online if you need to.