[DeadCode] Keep parent-delegating constructor when its docblock refines parameter types

[TomasVotruba]

Bug

RemoveParentDelegatingConstructorRector removes a constructor that only calls parent::__construct(...) with the same arguments — but it ignores the docblock. When the child constructor exists purely to refine parameter types via PHPDoc, removing it silently drops that type information.

Reported from webonyx/graphql-php, which had to skip the rule on CustomScalarType.php (commit 5da64b9, "Ignore overzealous rector"):

class CustomScalarType extends ScalarType
{
    /**
     * @param array<string, mixed> $config
     *
     * @phpstan-param CustomScalarConfig $config
     */
    public function __construct(array $config)
    {
        parent::__construct($config);
    }
}

The native signature (array $config) matches the parent, so the rule considered the constructor redundant and removed it — along with the @param array<string, mixed> / @phpstan-param CustomScalarConfig refinement. Callers would then be type-checked against the parent's looser array type.

Fix

Skip removal when the constructor's docblock declares any parameter-type tag (@param, @phpstan-param, @psalm-param), since that refines types beyond the native signature.

Added fixture skip_param_refining_docblock.php.inc (no-change), which is fully removed without the guard.

[TomasVotruba]

LGTM 👍