nx_consul_health_test.nx

nx_consul_health_test.nx -- CHEALTHGATE: proves the flap-protected, probe-driven health checks and that they close the loop into discovery. fail_thr=3, pass_thr=2. GREEN iff: 1 failure keeps PASSING (flap protection); 3 consecutive failures -> CRITICAL; 1 success after CRITICAL is NOT enough; 2 successes -> PASSING (recovery); a success resets the failure counter; and at the registry level a node driven CRITICAL is dropped from discovery while a 1-fail (flap-protected) node stays. exit 0 on 7/7.