nx_fabric_cc_gate.nx

nx_fabric_cc_gate.nx -- LIVE GATE for R2 (congestion control + telemetry over RTT). Proves: a DCTCP-style ECN-telemetry controller holds the bottleneck queue near a low setpoint K at FULL utilisation over an RTT link, where an open-loop window bufferbloats -- with negative controls so the result cannot be rigged. criteria: 1 R2 utilisation >= 90% (keeps the RTT link full) 2 R2 q_p99 <= 3*K (queue BOUNDED near the ECN setpoint) 3 baseline util >= 90% AND baseline q_p99 >= 3*R2 q_p99 (open-loop BLOATS at equal util) 4 R2 telemetry error == 0 (reported queue tracks the true queue) negative controls: NC1 ignore ECN marks -> queue bloats (>= 3*R2) (the REACTION holds the queue) NC2 never mark (K huge) -> queue bloats (>= 3*R2) (the TELEMETRY SIGNAL is essential) NC3 telemetry recount matches on every run (no fabricated telemetry) expect_exit: 0 license_tier: ORIGINAL