docs(claude): update testing guidelines and add note on Application::team relationship

CLAUDE.md

@@ -651,4 +651,8 @@ it('has emails', function (string $email) {
 
 - Every change must be programmatically tested. Write a new test or update an existing test, then run the affected tests to make sure they pass.
 - Run the minimum number of tests needed to ensure code quality and speed. Use `php artisan test` with a specific filename or filter.
-</laravel-boost-guidelines>
+</laravel-boost-guidelines>
+
+
+Random other things you should remember:
+- App\Models\Application::team must return a relationship instance., always use team()