Add JetBrainsMono Nerd Font files

Private repo only — not pushed to public GitHub.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.gitignore

@@ -1,5 +1,5 @@
 # Font files — download separately from nerdfonts.com
-fonts/
+# fonts/  # temporarily unignored for private push
 
 # macOS
 .DS_Store