Add PreMountMethodSignatureRule

[Kocal]

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[Copilot]

Pull request overview

This PR adds a new PHPStan rule PreMountMethodSignatureRule that enforces the correct signature for methods annotated with the #[PreMount] attribute in Symfony UX TwigComponent and LiveComponent classes. The rule ensures these lifecycle hook methods are public, accept exactly one array parameter, and return an array.

Key Changes

• New PHPStan rule validates #[PreMount] method signatures with comprehensive error reporting for visibility, return type, and parameter validation
• Migrated from PHPStan baseline file to a cleaner ignoreErrors configuration for test fixtures
• Added comprehensive documentation with clear examples of both violations and correct usage

Reviewed changes

Copilot reviewed 16 out of 16 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/Rules/TwigComponent/PreMountMethodSignatureRule.php	Implements the core validation rule with five distinct error identifiers for different signature violations
tests/Rules/TwigComponent/PreMountMethodSignatureRule/PreMountMethodSignatureRuleTest.php	Test class with comprehensive test methods covering violations and valid cases for both TwigComponent and LiveComponent
tests/Rules/TwigComponent/PreMountMethodSignatureRule/Fixture/ValidTwigComponent.php	Valid test fixture for #[AsTwigComponent] attribute
tests/Rules/TwigComponent/PreMountMethodSignatureRule/Fixture/ValidLiveComponent.php	Valid test fixture for #[AsLiveComponent] attribute
tests/Rules/TwigComponent/PreMountMethodSignatureRule/Fixture/NotAComponent.php	Test fixture ensuring rule only applies to component classes
tests/Rules/TwigComponent/PreMountMethodSignatureRule/Fixture/InvalidNotPublic.php	Test fixture for non-public visibility violation
tests/Rules/TwigComponent/PreMountMethodSignatureRule/Fixture/InvalidNoReturnType.php	Test fixture for missing return type violation
tests/Rules/TwigComponent/PreMountMethodSignatureRule/Fixture/InvalidWrongReturnType.php	Test fixture for incorrect return type (void) violation
tests/Rules/TwigComponent/PreMountMethodSignatureRule/Fixture/InvalidNoParameter.php	Test fixture for missing parameter violation
tests/Rules/TwigComponent/PreMountMethodSignatureRule/Fixture/InvalidTooManyParameters.php	Test fixture for too many parameters violation
tests/Rules/TwigComponent/PreMountMethodSignatureRule/Fixture/InvalidWithNullableReturnType.php	Test fixture for nullable return type (?array) violation
tests/Rules/TwigComponent/PreMountMethodSignatureRule/Fixture/InvalidWrongParameterType.php	Test fixture for incorrect parameter type (string) violation
tests/Rules/TwigComponent/PreMountMethodSignatureRule/config/configured_rule.neon	PHPStan configuration for the rule in tests
phpstan.dist.neon	Replaced baseline approach with path-based ignoreErrors for test fixtures
phpstan-baseline.neon	Removed baseline file in favor of cleaner ignoreErrors configuration
README.md	Added comprehensive documentation with examples of violations and correct usage

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