Looking through the page and the main readme I have lots of questions...

I'm vaguely curious what is or is not missing for aarch/riscv, also what else is/is not implemented? e.x. is there audio support? can I plug a USB drive in?

Also, Is there a section with documentation on the architecture?

This first Rust/Zig kernel that allows Linux drivers to be ported over with ease (LLM assisted) could pick up a lot of run-on-bare-metal usage. Linux is the only FLOSS kernel that has broad hardware support.