nx_linux_guest_gate.nx

nx_linux_guest_gate.nx -- F103c "Linux guest lane" (os lane, critical path; deps F103a=D F103b=D 2026-07-21). THE CLAIM: the Linux ABI exists in NishiOS ONLY as a LABELED interop GUEST LANE (contract C09, backend linux-host-syscalls) and that lane WORKS end-to-end as a real process substrate: guest spawn (fork+dup3+execve+wait4) with exit-code propagation, byte-exact stdout capture, stderr on the same capture, envp delivery, determinism -- while the NATIVE lane REFUSES Linux guests BY CONSTRUCTION (host paths unresolvable in the block-VFS; planted ELF bytes rejected by verify-before-execute with NO output fabricated). D001: emits the nx_gate_verdict contract. REFUTATION: argv[1]=negctl corrupts ONE byte of the expected stdout capture -> the byte-exact capture tooth (C03) MUST go RED alone; registered sibling nx_linux_guest_negtest pins that arg. license_tier: ORIGINAL expect_exit: 0 No hw writes (Rule 26): guests are user-space children.