nx_main.nx

main.nx -- NishiLang-side compiler driver. Pipeline: source text -> lex -> parse -> opt -> regalloc -> riscv -> write-to-stdout. Stands in for main.c. Real source-file reading (openat + read + grow buffer) is a follow-up; this turn drives the pipeline from an in-memory source string so the whole stack of nx-side modules links cleanly through a single entry point. Once file I/O is in syscalls.nx and string concatenation lands, this driver becomes the authoritative NishiLang compiler -- the C nxc2 retires behind it.