Finalized 1.0

• Updated codebase for PHP 8 compatibility, including stricter type definitions and nullable return types in error handlers.
• Replaced Exception type hints with Throwable to correctly capture all errors and exceptions in modern PHP environments.
• Refactored error bitmask handling to remove deprecated syntax and ensure correct error suppression logic.
• Improved fatal error detection logic in shutdown handlers.
• Added PHPStan and Rector configuration for static analysis and automated code quality improvements.
• Updated composer.json requirements to PHP 8.0+.