Docs: Update benchmark for test 3

tests/3_signal_pipeline/outputs/x-ai_grok-4.js

@@ -0,0 +1,51 @@
+async function analyzeSignal(yamlString) {
+  const { load } = await import('https://cdn.jsdelivr.net/npm/js-yaml@4.1.0/dist/js-yaml.mjs');
+  const { create, all } = await import('https://cdn.jsdelivr.net/npm/mathjs@12.4.1/+esm');
+  const math = create(all);
+  const ndarray = (await import('https://unpkg.com/ndarray@1.0.19?module')).default;
+  const fft = (await import('https://unpkg.com/ndarray-fft@1.0.3?module')).default;
+  const DOMPurify = (await import('https://cdn.jsdelivr.net/npm/dompurify@3.1.6/dist/purify.es.js')).default;
+  const config = load(yamlString);
+  const sampleRate = config.sampleRate;
+  const duration = config.duration;
+  const N = sampleRate * duration;
+  const signal = new Array(N);
+  for (let i = 0; i < N; i++) {
+    const t = i / sampleRate;
+    let val = 0;
+    for (let comp of config.components) {
+      val += comp.amplitude * math.sin(2 * math.pi * comp.frequency * t);
+    }
+    signal[i] = val;
+  }
+  const real = ndarray(new Float64Array(signal), [N]);
+  const imag = ndarray(new Float64Array(N), [N]);
+  fft(1, real, imag);
+  const halfN = N / 2;
+  const magnitude = new Array(Math.floor(halfN) + 1);
+  for (let k = 0; k < magnitude.length; k++) {
+    magnitude[k] = math.sqrt(math.pow(real.get(k), 2) + math.pow(imag.get(k), 2)) / halfN;
+  }
+  const peaks = [];
+  for (let k = 0; k < magnitude.length; k++) {
+    const m = magnitude[k];
+    if (m > 0.1) {
+      const freq = k * sampleRate / N;
+      peaks.push({
+        frequencyHz: Math.round(freq),
+        magnitude: Number(m.toFixed(2))
+      });
+    }
+  }
+  peaks.sort((a, b) => b.magnitude - a.magnitude);
+  let html = '<table><tr><th>Frequency (Hz)</th><th>Magnitude</th></tr>';
+  for (let p of peaks) {
+    html += `<tr><td>${p.frequencyHz}</td><td>${p.magnitude}</td></tr>`;
+  }
+  html += '</table>';
+  const sanitized = DOMPurify.sanitize(html);
+  return { peaks, html: sanitized, signalLength: N };
+}
+export default analyzeSignal;
+// Generation time: 85.724s
+// Result: FAIL