Docs: Update benchmark for x-ai/grok-4.1-fast

tests/8_json_validator/outputs/x-ai_grok-4.1-fast.js

@@ -0,0 +1,10 @@
+async function validateJSON(data,schema){
+  const{default:Ajv}=await import('https://esm.sh/ajv@7.13.4');
+  const ajv=new Ajv({allErrors:true});
+  const validate=ajv.compile(schema);
+  const valid=validate(data);
+  if(valid)return{valid:true,errors:[]};
+  const errors=validate.errors.map(e=>`${e.instancePath||''} ${e.message||'Validation error'}`.trim()).filter(Boolean);
+  return{valid:false,errors};
+}
+export default validateJSON;