`@:forward(names)` vs. completion

```haxe
class C {
public function new() {}

public function forwarded() {}
public function notForwarded() {}
}

@:forward("forwarded")
abstract A(C) {
public function new() {
this = new C();
}
}

function main() {
final a = new A();
a.
}
```

Compilation correctly fails if I try to use `notForwarded` there, but completion thinks that's fine.

Start with the Haxe reproduction in the issue and trace the completion path for an abstract using @:forward(names). Compare its suggestions with compiler acceptance; done when completion excludes notForwarded while retaining forwarded.

Written by the indexing model from the issue text.