Apply Roslyn/dotnet-format fixes across NeonSprawl.Server and
NeonSprawl.Server.Tests: collection expressions, concrete helper
return types, record XML docs, logging guards, quest store refactors,
and removal of redundant usings via GlobalUsings.cs. Extend
csharp-style.md with the recurring patterns.
GET/POST /game/players/{id}/perk-state with versioned JSON, engine-backed
branch selection, PerkStateApiTests, Bruno collection, README, and E2.M3 alignment.
VinPropane