Ref T7094. This makes the underlying class take a $user parameter, and then the worker just hands it an omnipotent user. Said underyling class is the benefactor of a small re-factor, dropping one query per-use, though the single query that now remains is policy-based so maybe its a wash or even worse. Still, gotta love one less query.

a little tricky to test so some extra thought instead

basic acceptance test with bin/repository reparse --change rValidHashHere -- it worked!