nx_hangprobe_gate.nx

nx_hangprobe_gate.nx -- a gate that DELIBERATELY HANGS, to prove /api/gate_run's deadline actually fires AND reaps. license_tier: ORIGINAL WHY THIS EXISTS: seq1425 said the deadline freed the CALLER but not the CHILDREN, turning a hang into a leak. You cannot prove that fixed with a gate that exits on its own -- you need one that genuinely hangs. SHAPE = the exact seq1383 incident: fork a GRANDCHILD that sleeps holding the inherited stdout write end, then the gate itself sleeps past any sane deadline. That grandchild is the hard case: killing only the direct child leaves the pipe open, so the parent's blocking read never sees EOF (tr_run_capture_to's own header calls this out, which is why it closes wfd BEFORE forking its watchdog). EXPECTED via POST /api/gate_run target=nx_hangprobe_gate&deadline_ms=3000: verdict TIMEOUT, response returns in ~3s, and ZERO nx_hangprobe processes survive afterwards. This gate NEVER passes -- it is a fixture, not a check. It is named *_gate only so gate_run will run it.