nx_behaveprobe_gate.nx

nx_behaveprobe_gate.nx -- THE REFEREE FOR THE PROMOTE RULER'S SUFFICIENCY HALF: A LIVE PROBE MUST READ A SIGNAL DEATH AS A SIGNAL DEATH, AND A PLAIN EXIT CODE AS ITSELF. WHY (2026-09-05, measured on the promote path). nx_behaveprobe reported rc=0 for a gate the crash guard had killed with SIGSEGV -- twice -- and that receipt cleared a crashing gate for promote. The rule was not missing: wait_status_rc (2026-08-25) reads a signal death as 128+signal, nx_waitrc_gate proves it, and nx_tool_run composes it. The SERVED probe was simply older than the rule, and nothing in the estate ever asked the live ruler the question. A STALE COPY OF A CORRECT INSTRUMENT IS INDISTINGUISHABLE FROM A BROKEN ONE, and the only cure that survives a promote is a referee that forks the LIVE binary against a subject that really dies by signal. That subject is nx_sigfixture (registered, dies by the named signal on itself; `exit <code>` is its control arm), and the probe's `self` mode compares live against itself so no stage slot is touched. SUBJECT = the DEPLOYED probe at its absolute nishihost path, forked in its own directory (the 08-22 lesson: a relative subject and a runner's cwd read as failing teeth about a correct binary). license_tier: ORIGINAL expect_exit: 0