Docs: Update benchmark for test 3

tests/3_signal_pipeline/outputs/google_gemini-3.1-flash-lite-preview.js

@@ -0,0 +1,42 @@
+async function analyzeSignal(yaml) {
+  const [yamlLib, math, ndarray, fft, purify] = await Promise.all([
+    import('https://cdn.skypack.dev/js-yaml'),
+    import('https://cdn.skypack.dev/mathjs'),
+    import('https://cdn.skypack.dev/ndarray'),
+    import('https://cdn.skypack.dev/ndarray-fft'),
+    import('https://cdn.skypack.dev/dompurify')
+  ]);
+
+  const { sampleRate, duration, components } = yamlLib.load(yaml);
+  const N = sampleRate * duration;
+  const real = ndarray(new Float64Array(N));
+  const imag = ndarray(new Float64Array(N));
+
+  for (let i = 0; i < N; i++) {
+    const t = i / sampleRate;
+    real.set(i, components.reduce((acc, c) => 
+      acc + c.amplitude * math.sin(2 * math.pi * c.frequency * t), 0));
+  }
+
+  fft(1, real, imag);
+
+  const peaks = [];
+  for (let k = 0; k <= N / 2; k++) {
+    const mag = math.sqrt(real.get(k) ** 2 + imag.get(k) ** 2) / (N / 2);
+    if (mag > 0.1) peaks.push({ 
+      frequencyHz: Math.round(k * sampleRate / N), 
+      magnitude: Math.round(mag * 100) / 100 
+    });
+  }
+
+  peaks.sort((a, b) => b.magnitude - a.magnitude);
+
+  const html = purify.sanitize(`<table><tr><th>Frequency (Hz)</th><th>Magnitude</th></tr>` +
+    peaks.map(p => `<tr><td>${p.frequencyHz}</td><td>${p.magnitude}</td></tr>`).join('') +
+    `</table>`);
+
+  return { peaks, html, signalLength: N };
+}
+export default analyzeSignal;
+// Generation time: 2.100s
+// Result: FAIL