entriphy/kl2_lv_decomp ? reverse-engineered prompt

Build me a working build of this Klonoa 2 decompilation project so I can compile the ELF and run it in PCSX2 with my own game disc image.

I want it to feel like the current repo is actually usable, even if the project is still early, so please fix anything that stops the build, make the setup steps clear, and keep the code organized the way a reverse engineering project like this needs. If something depends on the PS2 SDK or other current docs, look them up online if you need to.

Also make sure the output is an ELF named kl2_lv_decomp.elf, and that the project can be built from the root with CMake in a straightforward way. If there are obvious missing pieces, add sensible placeholders or stubs instead of leaving it broken. Keep the focus on matching the existing decompilation style and don’t introduce game assets or anything that would need to be shipped with the repo.