dotnet-channels Deep guide to for high-performance, thread-safe producer/consumer communication in .NET. Covers channel creation, backpressure strategies, IAsyncEnumerable integration, and graceful shutdown patterns. Out of scope: Hosted service lifecycle and registration are owned by [skill:dotnet-background-services]. Async/await fundamentals and cancellation token propagation are owned by [skill:dotnet-csharp-async-patterns]. Cross-references: [skill:dotnet-background-services] for integrating channels with hosted services, [skill:dotnet-csharp-async-patterns] for async patterns used in ch…