Summary

The CakePHP.Commenting.FunctionComment.Missing sniff currently flags every function without a docblock, even when the signature already expresses all type information natively. With constructor property promotion this is especially noisy:

final readonly class TenancySlice
{
    public function __construct(
        public string $x,
        public Decimal $y,
        public int $z,
    ) {
    }
}

Every parameter is already visibility-, type- and name-declared inline; a docblock would be pure redundancy.

This PR teaches the sniff to skip the `Missing` error when the function signature carries full native type information:

• `__construct` — skipped if every parameter has a native type (constructors cannot declare a return type).
• Any other function — skipped if it has a native return type and every parameter has a native type.

Functions that still lack types (untyped params, missing return types) continue to require a docblock, so legacy code is unaffected.

Other existing checks (spacing after docblock, `@throws` validation, etc.) are unchanged and still run whenever a docblock is present.