feat: add Avalonia Zafiro development, layout, and viewmodel skills

skills/avalonia-viewmodels-zafiro/SKILL.md

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+---
+name: avalonia-viewmodels-zafiro
+description: Optimal ViewModel and Wizard creation patterns for Avalonia using Zafiro and ReactiveUI.
+---
+
+# Avalonia ViewModels with Zafiro
+
+This skill provides a set of best practices and patterns for creating ViewModels, Wizards, and managing navigation in Avalonia applications, leveraging the power of **ReactiveUI** and the **Zafiro** toolkit.
+
+## Core Principles
+
+1.  **Functional-Reactive Approach**: Use ReactiveUI (`ReactiveObject`, `WhenAnyValue`, etc.) to handle state and logic.
+2.  **Enhanced Commands**: Utilize `IEnhancedCommand` for better command management, including progress reporting and name/text attributes.
+3.  **Wizard Pattern**: Implement complex flows using `SlimWizard` and `WizardBuilder` for a declarative and maintainable approach.
+4.  **Automatic Section Discovery**: Use the `[Section]` attribute to register and discover UI sections automatically.
+5.  **Clean Composition**: map ViewModels to Views using `DataTypeViewLocator` and manage dependencies in the `CompositionRoot`.
+
+## Guides
+
+- [ViewModels & Commands](viewmodels.md): Creating robust ViewModels and handling commands.
+- [Wizards & Flows](wizards.md): Building multi-step wizards with `SlimWizard`.
+- [Navigation & Sections](navigation_sections.md): Managing navigation and section-based UIs.
+- [Composition & Mapping](composition.md): Best practices for View-ViewModel wiring and DI.
+
+## Example Reference
+
+For real-world implementations, refer to the **Angor** project:
+- `CreateProjectFlowV2.cs`: Excellent example of complex Wizard building.
+- `HomeViewModel.cs`: Simple section ViewModel using functional-reactive commands.