⬆️ drop php 7

[garak]

Fix #67

[Copilot]

Pull Request Overview

A concise update dropping PHP 7 support and upgrading the codebase and test suite to PHP 8.1+, leveraging new language features and aligning CI and coding standards.

• Bumped minimum PHP version to 8.1 and updated composer dependencies & CI matrix
• Refactored core classes to use constructor property promotion and implement \Stringable
• Migrated PHPUnit data providers to attributes, added trailing commas, and marked most tests final

Reviewed Changes

Copilot reviewed 22 out of 22 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
composer.json	Raised PHP requirement to ^8.1; updated dev dependencies
.github/workflows/run-tests.yml	Removed PHP 7 from matrix; added extensions & flags
phpunit.xml	Updated schema location; replaced listeners with extension
.php-cs-fixer.php	Switched to @PHP81Migration; refined trailing-comma rule
src/Piece.php	Added \Stringable and used property promotion
src/Move.php	Added \Stringable, property promotion, trailing commas
src/History.php	Converted constructor to property promotion
src/Entry.php	Applied property promotion to all constructor params
src/Output/Link.php	Converted to property promotion on constructor
src/Output/ImagineOutput.php	Added trailing comma to parameters
src/Chess.php	Added trailing comma in recordMove call
tests/PieceTest.php	Made test class final; added JSON_THROW_ON_ERROR
tests/PiecePlacementTest.php	Made test class final
tests/PerftTest.php	Made test class final; switched to #[DataProvider]
tests/MoveTest.php	Imported DataProvider; added trailing commas
tests/MiscTest.php	Made test class final
tests/GameTest.php	Made test class final
tests/FenTest.php	Added #[DataProvider] annotation
tests/ConstructorTest.php	Made test class final
tests/ChessPublicator.php	Made test class final; added trailing comma
tests/AttackTest.php	Made test class final

Comments suppressed due to low confidence (3)

src/Output/Link.php:13

• [nitpick] Using $class as a property name can be confusing (it’s a reserved word). Consider renaming it to something more descriptive like $className or $cssClass.

    public function __construct(public ?string $class, public ?string $url)

tests/MoveTest.php:11

• The DataProvider import is not used in this file. Either remove it or add appropriate #[DataProvider] annotations to tests that need it for consistency.

use PHPUnit\Framework\Attributes\DataProvider;

tests/MoveTest.php:14

• [nitpick] Most test classes in this suite are declared final. Consider marking MoveTest as final as well to maintain consistency.

class MoveTest extends TestCase