Remove yarn comment from bin/update

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

Author: dadachi

bin/update

@@ -17,9 +17,6 @@ chdir APP_ROOT do
   system! 'gem install bundler --conservative'
   system('bundle check') || system!('bundle install')
 
-  # Install JavaScript dependencies if using Yarn
-  # system('bin/yarn')
-
   puts "\n== Updating database =="
   system! 'bin/rails db:migrate'