Rails load_defaults Upgrade Skill

This skill guides the incremental upgrade of config.load_defaults in a Rails application. The process walks through each config introduced in a new Rails version, one at a time, so the user can test each change in isolation.

Overview

When a Rails app has a load_defaults version lower than its Rails version, there are framework default configs that need to be adopted. This skill:

1. Detects the current load_defaults version
2. Determines the next target version
3. Generates the new_framework_defaults_X_Y.rb initializer with all configs commented
4. Walks through each config one by one, analyzing the codebase to recommend values
5. Waits for the user to test/commit each change before moving to the next
6. Consolidates into config/application.rb when all configs are done

Step 1: Detect Current State