✨ Set up Copilot instructions

[joe10832]

Configure instructions for this repository as documented in Best practices for Copilot coding agent in your repository.

[joe10832]

Using 'as any' to test unsupported actions bypasses type safety. Consider using a more type-safe approach or adding a comment explaining why this type assertion is necessary for testing error handling.

test("should throw error for unsupported action", async () => {
// Using 'as any' here to intentionally bypass type safety for testing error handling of unsupported actions.
Originally posted by @joe10832 in #75 (comment)