Wordmark: room for the whole DHCP circle

The rule's circle reached below the wordmark's box, cutting it off in the
README banner and on the login page.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

scripts/banner.py

@@ -40,7 +40,7 @@ def main():
 
     # The login page's sizes in pixels (style.css): a 104px logo, 10px above
     # a 290px wordmark whose viewBox is W+8 units wide.
-    mark_w, mark_h = w + 8, 162
+    mark_w, mark_h = w + 8, 176
     unit = mark_w / 290
     logo_size, gap = round(104 * unit, 1), round(10 * unit, 1)
     height = logo_size + gap + mark_h