Put a full-width product banner at the top of the README.

Co-authored-by: Cursor <cursoragent@cursor.com>

scripts/capture-screenshots.sh

@@ -21,9 +21,24 @@ capture() {
   echo "wrote $OUT/$name.png"
 }
 
+capture_banner() {
+  "$CHROME" \
+    --headless=new \
+    --disable-gpu \
+    --no-sandbox \
+    --hide-scrollbars \
+    --force-device-scale-factor=2 \
+    --window-size=1920,960 \
+    --default-background-color=00000000 \
+    --screenshot="$OUT/banner.png" \
+    "file://$SRC/banner.html"
+  echo "wrote $OUT/banner.png"
+}
+
 mkdir -p "$OUT"
 capture splash "$SRC/splash.html"
 capture session "$SRC/session.html"
 capture vision "$SRC/vision.html"
 capture menu "$SRC/menu.html"
+capture_banner
 cp -f "$ROOT/ui/icon.png" "$OUT/icon.png"