Docs: Update benchmark for test 4

tests/4_hexchain_pipeline/outputs/google_gemini-3.1-flash-lite-preview.js

@@ -0,0 +1,58 @@
+async function hexchain(tomlStr) {
+  const [
+    { parse },
+    { default: SR },
+    { mean, standardDeviation, median },
+    { default: Ajv },
+    { default: table },
+    { default: purify }
+  ] = await Promise.all([
+    import('https://esm.sh/smol-toml'),
+    import('https://esm.sh/seedrandom'),
+    import('https://esm.sh/simple-statistics'),
+    import('https://esm.sh/ajv'),
+    import('https://esm.sh/text-table'),
+    import('https://esm.sh/dompurify')
+  ]);
+
+  const config = parse(tomlStr),
+    ajv = new Ajv(),
+    schema = {
+      type: 'object',
+      required: ['seed', 'count', 'label'],
+      properties: {
+        seed: { type: 'string' },
+        count: { type: 'integer', minimum: 1, maximum: 10000 },
+        label: { type: 'string', minLength: 1 }
+      }
+    };
+
+  if (!ajv.validate(schema, config)) 
+    return { valid: false, errors: ajv.errorsText() };
+
+  const rng = new SR(config.seed),
+    data = Array.from({ length: config.count }, rng),
+    stats = {
+      mean: +mean(data).toFixed(6),
+      stddev: +standardDeviation(data).toFixed(6),
+      median: +median(data).toFixed(6)
+    },
+    tbl = table([
+      ['Stat', 'Value'],
+      ['mean', String(stats.mean)],
+      ['stddev', String(stats.stddev)],
+      ['median', String(stats.median)]
+    ]),
+    sanitized = purify.sanitize(`<pre class="stats">${tbl}</pre>`);
+
+  return { 
+    valid: true, 
+    label: config.label, 
+    stats, 
+    table: sanitized, 
+    count: config.count 
+  };
+}
+export default hexchain;
+// Generation time: 2.335s
+// Result: PASS