gravix-engine smoke test

Seven worlds, seven canvases, one library. Terrain, rings, a Lorenz attractor or bouncing box, a streamed fixture map with themes and sky, a parent/child hierarchy, a crowd, and a race. Right-click the map twice to re-route. Arrow keys drive the player car (click Restart if the race already finished). Crowd: drag the agent slider and switch KD vs brute to compare timings. ?backend=webgl forces the WebGL2 fallback; ?failDevice=1 makes WebGPU device creation fail so the fallback is exercised rather than assumed; ?points=N sets the cloud's capacity. Drag the point canvas to orbit.
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no map loaded
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arrows / WASD · first to the finish freezes
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