Very delightful article. Based on my experience in "hobby" OS programming, I would add setting up GDB debugging as early as possible. It was a great help in my projects and an improvement over debugging with the QEMU monitor only.
QEMU contains a built-in GDB server, you'll need a GDB client built for the target architecture (riscv in this case) and connecting to the QEMU GDB server over the network.
QEMU contains a built-in GDB server, you'll need a GDB client built for the target architecture (riscv in this case) and connecting to the QEMU GDB server over the network.
https://qemu-project.gitlab.io/qemu/system/gdb.html