Hello Packaged App Flow

This walkthrough follows a new packaged WinUI app from template to release proof.

Flow

dotnet new winui
  -> project file references Windows App SDK
  -> App.xaml wires application startup
  -> MainWindow.xaml defines first window
  -> Package.appxmanifest defines identity/capabilities
  -> dotnet build compiles
  -> dotnet run launches with debug identity
  -> Visual Studio packaging creates MSIX/Store artifact
  -> WACK validates package for Store readiness

Files To Inspect

File	Why it matters
`.csproj`	Target framework, WinUI enabled, package references, runtime properties
`App.xaml.cs`	Startup, activation, service wiring
`MainWindow.xaml`	Root UI and namespace correctness
`Package.appxmanifest`	Identity, capabilities, activation, Store package metadata

Evidence To Capture

Template source and date:
Windows App SDK version:
Build command result:
Run result:
Package artifact path:
WACK result:
Known gaps: