Docs: Update benchmark for openrouter/bert-nebulon-alpha

tests/9_stream_visualizer/outputs/openrouter_bert-nebulon-alpha.js

@@ -0,0 +1,41 @@
+const createStreamVisualizer = async (asyncIterable, {
+  maxPoints = 1000,
+  alpha = 0.3,
+  width = 800,
+  height = 400,
+  yDomain = [0, 1]
+} = {}) => {
+  const { scaleLinear, line } = await import('https://cdn.skypack.dev/d3@7');
+  const data = [];
+  let prevEma;
+
+  for await (const { timestamp, value } of asyncIterable) {
+    const ema = prevEma === undefined
+      ? value
+      : alpha * value + (1 - alpha) * prevEma;
+    prevEma = ema;
+
+    data.push({ timestamp, value, ema });
+    if (data.length > maxPoints) data.shift();
+  }
+
+  if (!data.length) return { data: [], path: '' };
+
+  const xScale = scaleLinear()
+    .domain([data[0].timestamp, data[data.length - 1].timestamp])
+    .range([0, width]);
+
+  const yScale = scaleLinear()
+    .domain(yDomain)
+    .range([height, 0]);
+
+  const pathGenerator = line()
+    .x(d => xScale(d.timestamp))
+    .y(d => yScale(d.ema));
+
+  return {
+    data,
+    path: pathGenerator(data)
+  };
+};
+export default createStreamVisualizer;