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- IContextualSerilogLogger<T> / ContextualSerilogLogger<T> in Services/Logging (handlers get a ForContext<T>-scoped logger via DI, consistent with ItemTracker) - SerilogRegistrar extension on WebApplicationBuilder (Api) - SerilogRegistrar extension on HostApplicationBuilder (Worker) - Both registrars: set Log.Logger, wire Logging + Host/Services, register ILogger singleton - ServiceCollectionExtensions: register IContextualSerilogLogger<> as transient - Program.cs in both apps simplified to single builder.AddSerilog() call Ref: IT-628 Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>