docs: add changelog for v1.0.0 release

Document complete feature set including 35+ Skia-rendered controls, full XAML support, X11/Wayland display servers, accessibility, platform services, gesture recognition, and project templates. Include fixes for GestureManager memory leak, text binding recursion, and rendering pipeline crash protection.

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+## [1.0.0] - 2026-03-06
+
+### Added
+- 35+ Skia-rendered controls: Button, Label, Entry, Editor, CheckBox, Switch, RadioButton, Slider, Stepper, Picker, DatePicker, TimePicker, SearchBar, Image, ImageButton, ProgressBar, ActivityIndicator, BoxView, Border, Frame, ScrollView, CollectionView, CarouselView, IndicatorView, SwipeView, RefreshView, GraphicsView, WebView, MenuBar
+- Navigation: NavigationPage, TabbedPage, FlyoutPage, Shell
+- Full XAML support with BindableProperty for all controls
+- Visual State Manager integration (Normal, PointerOver, Pressed, Focused, Disabled)
+- Data binding (OneWay, TwoWay, OneTime) with IValueConverter support
+- XAML styles, StaticResource, DynamicResource, merged ResourceDictionaries
+- X11 display server support with full input handling
+- Wayland support with XWayland fallback
+- SkiaSharp hardware-accelerated rendering with dirty region optimization
+- AT-SPI2 accessibility support (screen reader integration)
+- High contrast mode detection and color palette support
+- Input method support (IBus, Fcitx5, XIM)
+- HiDPI automatic scale factor detection (GNOME, KDE, X11)
+- Platform services: Clipboard, FilePicker, FolderPicker, Notifications, GlobalHotkeys, DragDrop, Launcher, Share, SecureStorage, Preferences, Browser, Email, SystemTray, VersionTracking, AppActions
+- Gesture recognition: Tap, Pan, Swipe, Pinch, Pointer, Drag/Drop
+- Project templates: `openmaui-linux` (code-based) and `openmaui-linux-xaml` (XAML-based)
+- Visual Studio extension with project templates and launch profiles
+- DiagnosticLog centralized logging infrastructure (conditional on DEBUG builds)
+- Configurable gesture thresholds (SwipeMinDistance, SwipeMaxTime, etc.)
+- Exception-safe rendering pipeline
+
+### Fixed
+- GestureManager memory leak (view tracking dictionaries now cleaned up on dispose)
+- Text binding recursion guard in EntryHandler
+- Rendering pipeline crash protection (exceptions in view Draw no longer crash the app)
+
+## [1.0.0-rc.1] - 2026-02-01
+
+### Added
+- 100% .NET MAUI API compliance - all public APIs use MAUI types
+- 217 passing unit tests
+
+## [1.0.0-preview.1] - 2025-06-01
+
+### Added
+- Initial preview release
+- Core rendering engine
+- Basic control set