Fix version compatibility matrix to match gemspec

Update minimum versions to reflect actual gem requirements:
- Ruby: 3.0 (not 3.2)
- Node.js: 18 (not 20)
- Shakapacker: 6.0 (not 8.2.0)
- Rails: 5.2 (not 6.1)

Add note clarifying that CI tests against higher versions but
the gem supports the lower versions shown.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

Author: justin808

docs/upgrading/release-notes/16.1.0.md

@@ -28,11 +28,13 @@ Then run `bundle install` and your package manager's install command.
 
 | Component   | Minimum | Recommended |
 | ----------- | ------- | ----------- |
-| Ruby        | 3.2     | 3.3+        |
-| Node.js     | 20      | 22+         |
-| Shakapacker | 8.2.0   | 8.2.0+      |
+| Ruby        | 3.0     | 3.3+        |
+| Node.js     | 18      | 22+         |
+| Shakapacker | 6.0     | 8.2.0+      |
 | React       | 18      | 18+         |
-| Rails       | 6.1     | 7.0+        |
+| Rails       | 5.2     | 7.0+        |
+
+**Note:** CI tests against Ruby 3.2+ and Node.js 20+, but the gem supports lower versions as shown above.
 
 ## New Features in v16.1.0
 
@@ -60,14 +62,35 @@ ReactOnRails.configure do |config|
 end
 ```
 
+### Enhanced bin/dev Script
+
+The updated `bin/dev` script provides better development server management with support for multiple modes:
+
+- `bin/dev` - Default HMR mode with webpack-dev-server
+- `bin/dev static` - Watch mode without HMR
+- `bin/dev prod` - Development with production-optimized assets
+
+### Multiple Procfile Support
+
+Three Procfile configurations for different development scenarios:
+
+1. **Procfile.dev** (HMR mode) - Rails server + webpack dev server for client + webpack watch for server bundle
+2. **Procfile.dev-static-assets** (Static watch mode) - Rails server + webpack watch mode
+3. **Procfile.dev-prod-assets** (Production assets in development) - Rails server with production-optimized assets
+
+### Webpack Configuration Updates
+
+- New `generateWebpackConfigs.js` helper for better configuration management
+- Improved babel.config.js setup
+
 ### Generator Improvements
 
 **Note:** These improvements only affect newly generated code from `rails g react_on_rails:install` or component generators. Existing applications are unaffected.
 
 - Modern TypeScript patterns with better type inference
 - Optimized tsconfig.json with `"moduleResolution": "bundler"`
 - Enhanced Redux TypeScript integration
-- Smart `bin/dev` defaults
+- Smart `bin/dev` defaults that auto-navigate to `/hello_world` route
 
 ## Security Enhancements