docs: Restore code fence around ASCII art title

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

README.md

@@ -1,9 +1,11 @@
+```
  ██████╗██╗      █████╗ ██╗   ██╗██████╗ ███████╗    ███╗   ███╗ ██████╗ ██████╗ ███████╗
 ██╔════╝██║     ██╔══██╗██║   ██║██╔══██╗██╔════╝    ████╗ ████║██╔═══██╗██╔══██╗██╔════╝
 ██║     ██║     ███████║██║   ██║██║  ██║█████╗      ██╔████╔██║██║   ██║██║  ██║███████╗
 ██║     ██║     ██╔══██║██║   ██║██║  ██║██╔══╝      ██║╚██╔╝██║██║   ██║██║  ██║╚════██║
 ╚██████╗███████╗██║  ██║╚██████╔╝██████╔╝███████╗    ██║ ╚═╝ ██║╚██████╔╝██████╔╝███████║
  ╚═════╝╚══════╝╚═╝  ╚═╝ ╚═════╝ ╚═════╝ ╚══════╝    ╚═╝     ╚═╝ ╚═════╝ ╚═════╝ ╚══════╝
+```
 
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