nx_syscall_sanity_kat.nx

nx_syscall_sanity_kat.nx -- T11 class: the SYSCALL-NUMBER COLLISION gate that would have caught the whole class. The x86 backend feeds const syscall numbers through an RV64->x86_64 translator; an x86_64 number that collides with an RV64 key was silently mistranslated (clone56->openat, execve59->pipe, wait4 61-> getdents, socket41->unshare, kill62->lseek). Each miscompile produces WRONG RUNTIME BEHAVIOR, so exercising every collision-prone wrapper and asserting a sane result catches any regression. Self-checking: exit 0 == all correct. See reference-syscall-number-rv64-x86-collision-2026-07-16. license_tier: ORIGINAL No hw writes (Rule 26).