Like the technical fix-uppery of the 2.0 update it’s launching alongside, STALKER 2: Heart of Chornobyl’s Cost of Hope expansion arrives with a determinedly furrowed brow; that kind of enthusiastic, if just slightly contrite, look of someone hellbent on righting their own past wrongs. Of course, most of the open-world shooter’s past crimes are long absolved, if not forgiven immediately on the grounds that they were committed amid an actual war. But Cost of Hope does serve as a second…