docs: promote llm-assisted react_on_rails migration

Author: justin808

README.md

@@ -21,6 +21,7 @@ While ShakaCode will continue to support this gem, you might consider migrating
 Why? React on Rails code receives much more active development and testing. For example, consider the [ReactRailsUJS](https://github.com/reactjs/react-rails/blob/main/react_ujs/index.js) implementation compared to the [ReactOnRails Node package](https://github.com/shakacode/react_on_rails/tree/master/node_package) which is written in TypeScript. For another example, React on Rails has work underway to support the latest React features, such as [React Server Components](https://react.dev/reference/rsc/server-components).
 
 You can find [migration to React on Rails steps here](https://github.com/reactjs/react-rails/blob/main/docs/migrating-from-react-rails-to-react_on_rails.md).
+For the fastest path, try the [LLM-assisted migration prompt](https://github.com/reactjs/react-rails/blob/main/docs/migrating-from-react-rails-to-react_on_rails.md#llm-assisted-migration-prompt).
 
 ---
 ## ShakaCode Support

docs/migrating-from-react-rails-to-react_on_rails.md

@@ -5,6 +5,7 @@
 
 - [Why migrate?](#why-migrate)
 - [Steps to migrate](#steps-to-migrate)
+- [LLM-assisted migration prompt](#llm-assisted-migration-prompt)
 
 <!-- END doctoc generated TOC please keep comment here to allow auto update -->
 
@@ -61,3 +62,34 @@ In this guide, it is assumed that you have upgraded the `react-rails` project to
 
 You can also check [react-rails-to-react-on-rails](https://github.com/shakacode/react-rails-example-app/tree/react-rails-to-react-on-rails) branch on [react-rails example app](https://github.com/shakacode/react-rails-example-app) for an example of migration from `react-rails` v3 to `react_on_rails` v13.4.
 
+## LLM-assisted migration prompt
+
+You can usually do a safe first-pass migration quickly with a coding assistant. Give it this prompt:
+
+```text
+You are a senior Rails + React engineer. Migrate this app from react-rails to react_on_rails.
+
+Use this guide as the source of truth:
+https://github.com/reactjs/react-rails/blob/main/docs/migrating-from-react-rails-to-react_on_rails.md
+
+Requirements:
+1. Keep changes minimal and production-safe.
+2. Work in clear phases:
+   - dependencies
+   - installer changes
+   - bundle entry points
+   - view helper updates
+   - cleanup
+3. At each phase:
+   - explain what changed and why
+   - show commands run
+   - show exact files changed
+4. Do not remove behavior unless you explain the replacement.
+5. Run tests/lint after each phase and report failures before continuing.
+6. End with:
+   - a migration checklist
+   - rollback steps
+   - a PR summary with risk level
+```
+
+Review all generated diffs before merging.