Docs: Update benchmark results

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

@@ -1,50 +1,33 @@
-async function createStreamVisualizer(asyncIterable, {
-  maxPoints,
-  alpha,
-  width,
-  height,
-  yDomain
-}) {
-  const {
-    scaleLinear,
-    line
-  } = await import('d3');
-
+async function createStreamVisualizer(
+  asyncIterable,
+  { maxPoints, alpha, width, height, yDomain }
+) {
+  const { scaleLinear, line } = await import('d3');
   const data = [];
-  let prevEma;
+  let ema = null;
 
-  for await (const { value, timestamp } of asyncIterable) {
-    prevEma = (prevEma === undefined) ?
-      value :
-      alpha * value + (1 - alpha) * prevEma;
-
-    data.push({
-      timestamp,
-      value,
-      ema: prevEma
-    });
+  for await (const point of asyncIterable) {
+    ema = ema === null ? point.value : alpha * point.value + (1 - alpha) * ema;
+    data.push({ ...point, ema });
     if (data.length > maxPoints) {
       data.shift();
     }
   }
 
-  if (!data.length) {
-    return {
-      data,
-      path: ''
-    };
+  if (data.length < 2) {
+    return { data, path: "" };
   }
 
-  const x = scaleLinear([data[0].timestamp, data.at(-1).timestamp], [0, width]);
+  const x = scaleLinear(
+    [data[0].timestamp, data.at(-1).timestamp],
+    [0, width]
+  );
   const y = scaleLinear(yDomain, [height, 0]);
 
   const path = line()
-    .x(d => x(d.timestamp))
-    .y(d => y(d.ema))(data);
+    .x(p => x(p.timestamp))
+    .y(p => y(p.ema))(data);
 
-  return {
-    data,
-    path: path ?? ''
-  };
+  return { data, path };
 }
 export default createStreamVisualizer;