Require PHP 8.1+, modernize toolchain

[janedbal]

Raises the PHP floor to ^8.1 and modernizes the project, following the recently-migrated ShipMonk OSS packages (name-collision-detector, composer-dependency-analyser).

Changes

Version floor & dependencies

• composer.json: php ^7.4 || ^8.0 → ^8.1; phpunit/phpunit ^9.6 → ^10.5.62
• phpstan.neon.dist: phpVersion.min 70400 → 80100, max 80499 → 80599
• phpcs.xml.dist: php_version 70400 → 80100

PHPUnit 10 config migration (phpunit.xml.dist)

• beStrictAboutCoversAnnotation → beStrictAboutCoverageMetadata
• beStrictAboutTodoAnnotatedTests / failOnRisky / failOnWarning → failOnAllIssues + displayDetailsOnAllIssues
• cacheResultFile → cacheDirectory

CI (.github/workflows/checks.yml)

• Drop PHP 7.4 / 8.0
• Split into a checks job (full composer check on PHP 8.5) and a tests matrix over PHP 8.1–8.5 × prefer-lowest/prefer-stable (Linux-only — DocCommentSpacingTest execs vendor/bin/phpcs directly, which won't work on Windows)

Source modernization

• strpos(…) === false → !str_contains(…) in DoubleArrowSpacingSniff and DocCommentSpacingTest
• Trailing commas added to multi-line declarations — the php_version bump activates slevomat's RequireTrailingCommaInDeclaration (a PHP 8.0+ feature previously suppressed); auto-fixed across 9 files

The sniffs were already modern (strict_types, typed signatures, final, generics) and are stateless, so there were no properties/constructors to promote. process(File, $pointer) keeps $pointer untyped because the Sniff interface declares it untyped.

Verification

Full composer check passes (cs, phpstan level max, 22 tests, normalize/validate, dependency analyser, collision detector) on both prefer-stable (PHPUnit 10.5.63) and prefer-lowest (PHPUnit 10.5.62, slevomat 8.28.0).

Note

Backward-incompatible (raised PHP floor) — should be released as 0.3.0.

Co-Authored-By: Claude Code