Docs: Update benchmark results

tests/9_stream_visualizer/outputs/google_gemini-2.5-pro.js

@@ -0,0 +1,60 @@
+async function createStreamVisualizer(asyncIterable, {
+  maxPoints,
+  alpha,
+  width,
+  height,
+  yDomain
+}) {
+  const {
+    scaleLinear,
+    line
+  } = await import('d3');
+
+  const data = [];
+  let prevEma = null;
+
+  for await (const {
+      timestamp,
+      value
+    } of asyncIterable) {
+    const ema = prevEma === null ?
+      value :
+      alpha * value + (1 - alpha) * prevEma;
+
+    data.push({
+      timestamp,
+      value,
+      ema
+    });
+    prevEma = ema;
+
+    if (data.length > maxPoints) {
+      data.shift();
+    }
+  }
+
+  if (data.length < 2) {
+    return {
+      data,
+      path: ''
+    };
+  }
+
+  const x = scaleLinear()
+    .domain([data[0].timestamp, data.at(-1).timestamp])
+    .range([0, width]);
+
+  const y = scaleLinear()
+    .domain(yDomain)
+    .range([height, 0]);
+
+  const path = line()
+    .x(d => x(d.timestamp))
+    .y(d => y(d.ema))(data);
+
+  return {
+    data,
+    path
+  };
+}
+export default createStreamVisualizer;