nx_syscalls_x86_64.nx

nx_syscalls_x86_64.nx -- ALIAS STUB (debt 1785528831, 2026-07-31). THE WRAPPER SET NOW LIVES ONCE, IN nx_syscalls.nx. This file remains only so the ~248 sources that `import "nx_syscalls_x86_64.nx"` keep resolving unchanged; the import layer dedups by canonicalised path, so a translation unit reaching BOTH names now gets ONE definition set instead of two. Same pattern as parse.nx -> nx_parse.nx. WHAT THIS FIXES: this module defined the full syscall wrapper set against RAW x86 numbers with no conditionals, while nx_syscalls.nx defines the SAME wrappers inside @ifndef TARGET_X86_64 against RV64 numbers that the backend translates at emit. Any TU reaching both held EVERY wrapper twice and resolved it SILENTLY BY DEFINITION ORDER -- nx_cc accepted the redefinition without a diagnostic (debt 1785447657). Reverse import-reachability over 17499 sources measured 37 such files. ORDERING THAT MADE THIS SAFE (do not reorder if this is ever redone): the toolchain carrying translator rows 40->165 mount and 51->161 chroot was promoted FIRST. Without them the RV64 numbers pass through verbatim as x86 sendfile/getsockname -- measured, $40 x3 / $51 x2 -- because x86ctx_rv64_to_x86_64_syscall's default branch is `return num`. Deprecation: delete when every consumer imports "nx_syscalls.nx" directly.