nx_smoke_objdump.nx

nx_smoke_objdump.nx -- write -> read round-trip smoke test. Hand-builds an ELF (header + 1 PT_LOAD + 12 bytes of code), then inspects it via our sovereign nx_elf_read + nx_objdump tools. Verifies that what elf_writer-shape bytes look like, our reader correctly decodes -- the producer/consumer loop is round-trip clean entirely in NishiLang. No docker / qemu / binutils dependency. Run on any host with our nxc2.exe.