implement

Implements use cases for C# and Blazor (.NET 10) applications using a Vertical Slice Architecture. Takes a UC-XXX.md specification and generates feature-folder components, C# Commands/Queries, EF Core entities/configurations, and Blazor pages/components. Use when the user asks to "implement a use case in C#", "build a Blazor page", "create a Vertical Slice", or mentions Blazor, .NET 10, or C# implementation.