Turn code changes into Copilot migration rules.
What it does
Creates GitHub Copilot migration instructions from differences between two project states so future changes follow the same transformation patterns.
When to use it
Use when documenting framework upgrades, technology replacements, architecture refactoring, or design pattern modernization.
How to use it
Give it a project and its before-and-after references; it creates .github/copilot-migration-instructions.md with transformation rules derived from the changes.
What you provide
- the source branch, commit, or tag
- the target branch, commit, or tag
- An existing project
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