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.
Fix persistence test AAA layout, empty-id denial theory, frozen id constants,
Postgres rollback/JSONB read, XML doc cref, README Bruno link, and review doc.
Introduces IPlayerQuestStateStore (in-memory + V008 Postgres), QuestStepState
snapshots, DI wiring, AAA unit tests, and docs for E7M1-05 before NEO-117 ops.
VinPropane