nx_restart_guard_gate.nx

nx_restart_guard_gate.nx -- KAT + measured-vs-systemd scorecard for the supervisor crash-loop guard. MIGRATED 2026-09-02 onto nx_gate_verdict (D001): every tooth is a named gv_check, so /api/gate_run reads the verdict from the exit code and harness.jrnl records a frame. Before this the gate returned N for the failing assertion and printed its own verdict line, which /api/promote correctly refused. The teeth and their numbers are unchanged. T1 healthy (restarts spread > interval) -> never trips T2 crash-loop (6 restarts in 10s, burst=5) -> 1st-5th allowed, 6th TRIPS (give up) T3 recovery (quiet > interval) -> window resets, restart allowed again T4 exponential backoff (base*2^(n-1), capped) vs systemd's fixed RestartSec T5 DETERMINISM (the exceed): same timestamps -> identical trip point on a re-run (replayable) T6-T10 bind-grace: alive-but-never-listening (debt 1788361379, the 16 h /search outage class) T11-T15 stale-cycle liveness: alive-by-NAME is not alive (the orphan /status child of a dead fleet supervisor) license_tier: ORIGINAL No hw writes (Rule 26).