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.
Apply completionRewardBundle.reputationGrants via ReputationOperations with
compensating rollback; thread faction stores through quest wiring; add operator
chain Bruno helper and grid-contract accept success; update README and E7.M3 docs.