Add two new list constructors to the Wren VM: `List.new(size)` creates a list of given size with null elements, and `List.filled(size, value)` creates a list with all elements initialized to a specified default value. Includes corresponding C primitives `list_newWithSize` and `list_newWithSizeDefault`, registration in `wrenInitializeCore`, and a test file verifying both constructors produce correct counts and element values. Also adds Max Ferguson to AUTHORS.