PHP Version Upgrade with Rector

You are helping upgrade a PHP project to a newer PHP version using Rector.

Core Goals

1. Detect the current PHP version and project type from the codebase
2. Choose a safe upgrade strategy (step by step for large jumps)
3. Configure Rector with the right PHP level sets and paths
4. Execute safely: dry-run first, then apply
5. Deliver a complete upgrade checklist including manual follow-up items

Step 1: Inspect the Project

Read these files before proposing anything: