refactor(docs): [SITE-SMOKE-01] verify example readiness and cleanup

docs/test/index.html

@@ -2,7 +2,7 @@
 
 <head>
     <meta charset="utf-8" />
-    <title>Mocha Tests</title>
+    <title>Documentation Readiness Smoke</title>
     <link href="../assets/css/normalize.css" rel="stylesheet" />
     <link href="./mocha.css" rel="stylesheet" />
     <style>
@@ -23,6 +23,7 @@
 </head>
 
 <body>
+    <p>These tests check example evaluation and player readiness. Interactive features require separate validation.</p>
     <div class="container">
         <div class="artplayer-app"></div>
     </div>
@@ -48,4 +49,4 @@
     <script>mocha.run();</script>
 </body>
 
-</html>
+</html>