nx_netpredict_gate.nx

nx_netpredict_gate.nx -- proves the prediction+reconciliation core (nx_netpredict): (1) local prediction gives the player's own position IMMEDIATELY from local inputs (RTT hidden, zero input-to-feedback latency); (2) when the server agrees, reconciliation replays pending inputs and lands EXACTLY on the predicted position (no rubber-band); (3) when the server diverges on an event the client couldn't predict, reconciliation converges the client to the authoritative truth. The warzone "fun realtime, not laggy" feel across a 150ms ocean.