Convert Result from abstract class to interface

[Copilot]

This PR converts the Result type from an abstract class to an interface as requested in the issue. The change maintains full backward compatibility while providing a more flexible interface-based architecture.

Changes Made

Result.php

• Changed from abstract readonly class Result to interface Result
• Removed abstract keyword from all method declarations (interfaces have implicitly abstract methods)
• Preserved all method signatures, return types, and PHPDoc annotations
• Maintained generic template types (@template T, @template E)

Ok.php and Err.php

• Updated class declarations from extends Result to implements Result
• Changed PHPDoc annotations from @extends Result<T, never> to @implements Result<T, never>
• Kept all #[Override] attributes (valid for interface implementations in PHP 8.3+)

Functional Verification

The conversion preserves all existing functionality:

• Type checking with instanceof Result works correctly
• All Result methods (isOk(), isErr(), unwrap(), map(), match(), etc.) function identically
• Generic type safety is maintained through PHPDoc templates
• Method chaining and monadic operations continue to work as expected

Example usage remains unchanged:

$result = new Ok("success");
$result->map(fn($x) => strtoupper($x))->unwrap(); // "SUCCESS"

$error = new Err("failed");
$error->unwrapOr("default"); // "default"

Fixes #5.

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[Copilot]

Pull Request Overview

This PR converts the Result type from an abstract class to an interface to provide a more flexible architecture while maintaining backward compatibility. The change affects the base Result type and its concrete implementations.

• Converts Result from abstract class to interface with implicit abstract methods
• Updates Ok and Err classes to implement the interface instead of extending the abstract class
• Changes PHPDoc annotations from @extends to @implements for proper interface documentation

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
src/Result.php	Converts abstract class to interface, removes abstract keywords from method declarations
src/Ok.php	Updates to implement Result interface instead of extending abstract class
src/Err.php	Updates to implement Result interface instead of extending abstract class

[Copilot]

Interface methods cannot have implementations, so the method declaration should not include a body. The semicolon is correct, but this applies to all methods in the interface.