Update version requirement to reflect v16

Author: justin808

AI_AGENT_INSTRUCTIONS.md

@@ -236,7 +236,7 @@ app/
 
 - Rails 7+ (Rails 8 supported), Ruby 3.0+ (Ruby 3.2+ for Rails 8), Node 20+
   LTS, Yarn
-- react_on_rails ~> 15.0+, shakapacker ~> 8.3+
+- react_on_rails ~> 16.0+, shakapacker ~> 8.3+
 - **Note**: Use `bundle info react_on_rails` to check latest available version
 
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