- Each view/window follows the `.axaml` + `.axaml.cs` split where the code-behind constructor simply calls `InitializeComponent()` and leaves logic to the ViewModel.
- Cross-thread UI marshalling goes exclusively through `SEngine.Dispatcher.Invoke` / `InvokeAsync` rather than direct `Dispatcher` usage in business code.
- User-facing dialogs are surfaced to the core via `IUIInvoker.Invoke`/`InvokeDialog<T>` by type-name reflection instead of direct window construction from non-UI assemblies.
- Persistent settings are implemented by having ViewModels implement `ISettingProvider` and registering handlers on `Options.SaveEvent`/`LoadEvent` to iterate `BaseViewModel.Instances`.