Create CHANGELOG.md

Author: KroderDev

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## Unreleased
+
+
+
+## [0.4.0] - 2025-07-01
+### Added
+- Gateway authentication controllers with comprehensive tests.
+- `RedirectsIfRequested` trait and redirect support in auth controllers.
+- Configurable `gateway_auth.default_redirect` setting.
+- `token()` method in `GatewayGuard`.
+- Logging for JWT key loading and decoding.
+- PHPDoc comments across `GatewayGuard` methods.
+- Laravel Pint integration and PSR-12 code style.
+
+### Changed
+- Removed `__get` magic method from `ExternalUser`.
+- Enhanced redirect logic and session handling in `GatewayGuard`.
+- Documentation reorganized with a new features list.
+- Commented out session migration due to CSRF conflicts.