Docs: Update benchmark for openrouter/pony-alpha

tests/9_stream_visualizer/outputs/openrouter_pony-alpha.js

@@ -0,0 +1,30 @@
+const createStreamVisualizer = async (iterable, { maxPoints, alpha, width, height, yDomain }) => {
+  const d3 = await import('https://esm.sh/d3');
+  const data = [];
+  let ema;
+
+  for await (const { timestamp, value } of iterable) {
+    ema = ema == null ? value : alpha * value + (1 - alpha) * ema;
+    data.push({ timestamp, value, ema });
+    if (data.length > maxPoints) data.shift();
+  }
+
+  if (!data.length) return { data, path: '' };
+
+  const x = d3.scaleLinear()
+    .domain([data[0].timestamp, data.at(-1).timestamp])
+    .range([0, width]);
+  const y = d3.scaleLinear()
+    .domain(yDomain)
+    .range([height, 0]);
+
+  const path = d3.line()
+    .x(d => x(d.timestamp))
+    .y(d => y(d.ema))
+    (data);
+
+  return { data, path };
+};
+export default createStreamVisualizer;
+// Generation time: 253.115s
+// Result: PASS