Add PHP 8.4 to build matrix and update documentation

Co-authored-by: lisachenko <[email protected]>

Author: Copilot

.github/copilot-instructions.md

@@ -88,7 +88,7 @@ php /tmp/test_reflection.php
 - `composer.json` - Dependencies: php >=8.2, nikic/php-parser ^5.0
 - `phpunit.xml.dist` - Test configuration (1536M memory limit)
 - `rector.php` - Code quality rules
-- `.github/workflows/phpunit.yml` - CI pipeline (PHP 8.2, 8.3)
+- `.github/workflows/phpunit.yml` - CI pipeline (PHP 8.2, 8.3, 8.4)
 
 ## Common Issues and Troubleshooting
 
@@ -143,12 +143,12 @@ php /tmp/test_reflection.php
 - Core functionality requires nikic/php-parser for AST generation
 - Tests use Composer's autoloader for class location
 - Memory usage can be high for large codebases (configure php.ini accordingly)
-- Compatible with PHP 8.2+ (tested on 8.2, 8.3)
+- Compatible with PHP 8.2+ (tested on 8.2, 8.3, 8.4)
 
 ## CI/Build Pipeline Reference
 
 The GitHub Actions pipeline (`.github/workflows/phpunit.yml`) runs:
-- Matrix testing: PHP 8.2, 8.3 on Ubuntu
+- Matrix testing: PHP 8.2, 8.3, 8.4 on Ubuntu
 - Dependency variations: lowest, highest
 - Standard `composer install` (works in CI with GitHub tokens)
 - PHPUnit test suite execution

.github/workflows/phpunit.yml

@@ -18,6 +18,7 @@ jobs:
         php-version:
           - "8.2"
           - "8.3"
+          - "8.4"
         operating-system:
           - "ubuntu-latest"