chore: add svg raw rendering probe

site/probe.svg

@@ -0,0 +1,12 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="1200" height="630" viewBox="0 0 1200 630">
+  <defs>
+    <linearGradient id="g" x1="0" y1="0" x2="1" y2="1">
+      <stop offset="0%" stop-color="#0ea5e9"/>
+      <stop offset="100%" stop-color="#22c55e"/>
+    </linearGradient>
+  </defs>
+  <rect width="1200" height="630" fill="#0b1220"/>
+  <rect x="40" y="40" width="1120" height="550" rx="20" fill="url(#g)" opacity="0.2"/>
+  <text x="80" y="170" fill="#e5f3ff" font-family="Arial, sans-serif" font-size="64" font-weight="700">DevOps Skills Probe</text>
+  <text x="80" y="250" fill="#b6cff2" font-family="Arial, sans-serif" font-size="34">If this renders as image, SVG delivery is possible.</text>
+</svg>