7 cases: rejects spaces, double-@, empty input; trims whitespace; lowercases domain only (preserving local-part case); equality by normalized value; __toString and getDomain. fails red - class App\\Shared\\ValueObject\\EmailAddress not yet defined.
composer create-project laravel/laravel + artisan install:api. sanctum removed (custom session-cookie auth per ai/backend-context). personal_access_tokens migration + config/sanctum.php deleted. default .gitignore excludes vendor/, .env, etc - composer install recreates vendor at setup time.
