[Chore]: Add ActionClassesMustBeInvokable rule and related tests

[Orrison]

Ticket(s) or GitHub Issue

• N/A

Technical Description

Adds the ActionClassesMustBeInvokable PHPStan rule to make it so actions must only have one public method and it should be __invoke so that they are invokable classes.

Excludes Filament "Action" classes.

Any deployment steps required?

No

Are any Feature Flags and/or Data Migrations that can eventually be removed Added?

No

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[Copilot]

Pull request overview

Adds a new PHPStan rule to enforce an “invokable action” convention (only __invoke may be public, aside from __construct) for configured Action namespaces, along with Pest tests and fixtures to validate the rule behavior.

Changes:

• Introduces ActionClassesMustBeInvokableRule and wires it into phpstan-extension.neon with configurable include/exclude namespace patterns.
• Adds a dedicated PHPStan test config plus a Pest test that runs PHPStan against fixtures.
• Adds fixture classes covering valid/invalid actions, modular namespaces, non-action namespaces, abstract actions, and Filament exclusions.

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/Rules/ActionClassesMustBeInvokable/ActionClassesMustBeInvokableRule.php	New PHPStan rule enforcing invokable-only public API for action classes matched by namespace patterns.
phpstan-extension.neon	Registers the new rule and adds default include/exclude namespace pattern parameters + schema.
tests/PHPStan/Configs/action-classes-must-be-invokable.neon	Standalone PHPStan config used by tests to exercise the rule with specific namespace patterns.
tests/PHPStan/ActionClassesMustBeInvokableTest.php	Pest test that runs PHPStan against fixtures and asserts identifiers are/aren’t reported.
tests/PHPStan/Fixtures/ActionInvokableFixture.php	Fixture for a valid action (__invoke public, helpers protected).
tests/PHPStan/Fixtures/ActionMissingInvokeFixture.php	Fixture missing __invoke and exposing a disallowed public method.
tests/PHPStan/Fixtures/ActionWithExtraPublicMethodFixture.php	Fixture with __invoke plus an extra public method (should be reported).
tests/PHPStan/Fixtures/AbstractActionFixture.php	Fixture ensuring abstract action classes are ignored.
tests/PHPStan/Fixtures/NonActionOutsideNamespaceFixture.php	Fixture ensuring non-action namespaces are ignored.
tests/PHPStan/Fixtures/ModularActionMissingInvokeFixture.php	Fixture exercising wildcard include patterns for modular action namespaces.
tests/PHPStan/Fixtures/FilamentActionExcludedFixture.php	Fixture intended to verify Filament action namespaces are excluded.
tests/PHPStan/Fixtures/NestedFilamentActionExcludedFixture.php	Fixture intended to verify nested Filament action namespaces are excluded.

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