Rewrite srdwm in Rust: working X11 and Wayland backends, Lua config

The C++ prototype (moved to legacy-cpp/) was mostly a design skeleton:
X11 and Windows backends were partially real, Wayland created the
wlroots object graph but never wired a single event listener, macOS
was stub except monitor enumeration, and the Lua engine's srd.bind()
stored a key-combo string but never the actual closure. See
docs/PRIOR_ART.md for the full audit.

This replaces it with a Cargo workspace:

- srdwm-core: platform-independent window/workspace/monitor state,
  a real master-stack tiling layout, and SmartPlacement grid/cascade/
  snap-to-edge placement - fixing several bugs in the C++ version
  (hardcoded 2-column grid, cascade that never cascaded, snap-to-edge
  that always returned a fixed rect). 35 unit tests.
- srdwm-config: the srd Lua API via mlua, implementing the surface
  docs/DEFAULTS.md always documented but the C++ engine never actually
  built (srd.window.close()/focus(direction), srd.workspace.next(),
  real keybinding closures, require("srd") support). 10 unit tests.
- srdwm-x11: a real reparenting WM with a drawn title bar (buttons,
  drag, resize), verified live under Xephyr - frame placement and
  client offset match srdwm-core's computed geometry exactly, and the
  decoration renders correctly on screen.
- srdwm-wayland: a from-scratch smithay compositor (the C++ version
  had nothing working to port from) - runs via the winit backend,
  tracks xdg-shell toplevels through the same WindowManager and
  hit-testing code X11 uses, verified to start/render/run without
  crashing. Decorations are solid-color (no text yet); see
  docs/IMPLEMENTATION_STATUS.md for exact scope.
- srdwm-windows / srdwm-macos: structured, cfg-gated designs informed
  by komorebi/glazewm and yabai/AeroSpace respectively (see
  docs/PRIOR_ART.md), honestly marked as unbuilt/unverified since this
  sandbox has no Windows or macOS target.

1 files changed, 0 insertions, 382 deletions

diff --git a/docs/GUI_SETTINGS.md b/docs/GUI_SETTINGS.md
deleted file mode 100644
index bc892b5..0000000
--- a/docs/GUI_SETTINGS.md
+++ /dev/null
@@ -1,382 +0,0 @@
-# SRDWM GUI Settings Program
-
-## Overview
-The SRDWM GUI Settings program provides a user-friendly interface for configuring the window manager without editing Lua files directly. It integrates seamlessly with existing system settings structures on Windows, macOS, and Linux.
-
-## Architecture
-
-### Cross-Platform GUI Framework
-- **Linux**: GTK4 with native desktop integration
-- **Windows**: WinUI 3 with Windows Settings integration
-- **macOS**: SwiftUI with System Preferences integration
-
-### System Integration
-- **Windows**: Appears in Windows Settings > System > Window Manager
-- **macOS**: Appears in System Preferences > Desktop & Screen Saver > Window Manager
-- **Linux**: Appears in GNOME Settings, KDE System Settings, etc.
-
-## Main Interface
-
-### 1. General Settings Tab
-```
-┌─────────────────────────────────────────────────────────┐
-│ General Settings                                        │
-├─────────────────────────────────────────────────────────┤
-│ Default Layout: [Dynamic ▼]                             │
-│ Smart Window Placement: ☑                              │
-│ Window Gap: [8] pixels                                 │
-│ Border Width: [2] pixels                               │
-│ Enable Animations: ☑                                   │
-│ Animation Duration: [200] ms                           │
-│                                                         │
-│ Focus Follows Mouse: ☐                                 │
-│ Mouse Follows Focus: ☑                                 │
-│ Auto Raise Windows: ☐                                  │
-│ Auto Focus Windows: ☑                                  │
-└─────────────────────────────────────────────────────────┘
-```
-
-### 2. Key Bindings Tab
-```
-┌─────────────────────────────────────────────────────────┐
-│ Key Bindings                                           │
-├─────────────────────────────────────────────────────────┤
-│ Layout Switching                                       │
-│ ├─ Tiling Layout: [Mod4+1] [Change] [Remove]          │
-│ ├─ Dynamic Layout: [Mod4+2] [Change] [Remove]         │
-│ └─ Floating Layout: [Mod4+3] [Change] [Remove]        │
-│                                                         │
-│ Window Management                                      │
-│ ├─ Close Window: [Mod4+q] [Change] [Remove]           │
-│ ├─ Minimize Window: [Mod4+m] [Change] [Remove]        │
-│ └─ Maximize Window: [Mod4+f] [Change] [Remove]        │
-│                                                         │
-│ [Add New Binding]                                      │
-└─────────────────────────────────────────────────────────┘
-```
-
-### 3. Layouts Tab
-```
-┌─────────────────────────────────────────────────────────┐
-│ Layouts                                                │
-├─────────────────────────────────────────────────────────┤
-│ Tiling Layout                                          │
-│ ├─ Split Ratio: [50]% [Reset]                         │
-│ ├─ Master Ratio: [60]% [Reset]                        │
-│ ├─ Auto Swap: ☑                                       │
-│ └─ Gaps: Inner [8] Outer [16] [Reset]                 │
-│                                                         │
-│ Dynamic Layout                                         │
-│ ├─ Snap Threshold: [50]px [Reset]                     │
-│ ├─ Grid Size: [6] [Reset]                             │
-│ ├─ Cascade Offset: [30]px [Reset]                     │
-│ └─ Smart Placement: ☑                                 │
-│                                                         │
-│ [Add Custom Layout]                                    │
-└─────────────────────────────────────────────────────────┘
-```
-
-### 4. Themes Tab
-```
-┌─────────────────────────────────────────────────────────┐
-│ Themes                                                 │
-├─────────────────────────────────────────────────────────┤
-│ Current Theme: [Nord ▼] [Preview]                     │
-│                                                         │
-│ Colors                                                 │
-│ ├─ Background: [■] #2e3440 [Change]                   │
-│ ├─ Foreground: [■] #eceff4 [Change]                   │
-│ ├─ Primary: [■] #88c0d0 [Change]                      │
-│ └─ Secondary: [■] #81a1c1 [Change]                    │
-│                                                         │
-│ Window Decorations                                     │
-│ ├─ Border Width: [2]px [Reset]                        │
-│ ├─ Title Bar Height: [24]px [Reset]                   │
-│ └─ Font: [JetBrains Mono 10] [Change]                 │
-│                                                         │
-│ [Import Theme] [Export Theme] [Create New]             │
-└─────────────────────────────────────────────────────────┘
-```
-
-### 5. Window Rules Tab
-```
-┌─────────────────────────────────────────────────────────┐
-│ Window Rules                                           │
-├─────────────────────────────────────────────────────────┤
-│ Rule 1: Firefox → Dynamic Layout                      │
-│ ├─ Match: Class = "firefox"                           │
-│ ├─ Action: Layout = "dynamic"                         │
-│ └─ [Edit] [Delete]                                    │
-│                                                         │
-│ Rule 2: Terminal → Tiling Layout                      │
-│ ├─ Match: Class = "terminal"                          │
-│ ├─ Action: Layout = "tiling"                          │
-│ └─ [Edit] [Delete]                                    │
-│                                                         │
-│ [Add New Rule]                                         │
-└─────────────────────────────────────────────────────────┘
-```
-
-### 6. Performance Tab
-```
-┌─────────────────────────────────────────────────────────┐
-│ Performance                                            │
-├─────────────────────────────────────────────────────────┤
-│ Graphics                                              │
-│ ├─ Enable V-Sync: ☑                                   │
-│ ├─ Max FPS: [60] [Reset]                              │
-│ └─ Enable Caching: ☑                                  │
-│                                                         │
-│ Memory                                                 │
-│ ├─ Window Cache Size: [100] [Reset]                   │
-│ ├─ Event Queue Size: [1000] [Reset]                   │
-│ └─ Layout Timeout: [16]ms [Reset]                     │
-│                                                         │
-│ [Optimize for Performance] [Reset to Defaults]         │
-└─────────────────────────────────────────────────────────┘
-```
-
-## Key Binding Editor
-
-### Add/Edit Key Binding Dialog
-```
-┌─────────────────────────────────────────────────────────┐
-│ Edit Key Binding                                      │
-├─────────────────────────────────────────────────────────┤
-│ Key Combination: [Press keys here...]                 │
-│ Current: Mod4+Shift+1                                 │
-│                                                         │
-│ Action Type: [Window Management ▼]                     │
-│ Action: [Close Window ▼]                              │
-│                                                         │
-│ Custom Command: [________________]                     │
-│                                                         │
-│ [Test Binding] [OK] [Cancel]                          │
-└─────────────────────────────────────────────────────────┘
-```
-
-### Key Combination Parser
-- **Mod4**: Super/Windows key
-- **Mod1**: Alt key
-- **Mod2**: Num Lock
-- **Mod3**: Scroll Lock
-- **Shift**: Shift key
-- **Ctrl**: Control key
-
-## Theme Editor
-
-### Color Picker Integration
-```
-┌─────────────────────────────────────────────────────────┐
-│ Color Picker                                           │
-├─────────────────────────────────────────────────────────┤
-│ Color: [■] #88c0d0                                    │
-│                                                         │
-│ RGB: R [136] G [192] B [208]                          │
-│ HSV: H [199] S [35] V [82]                            │
-│                                                         │
-│ Preset Colors:                                         │
-│ [■][■][■][■][■][■][■][■]                              │
-│                                                         │
-│ [Pick from Screen] [OK] [Cancel]                      │
-└─────────────────────────────────────────────────────────┘
-```
-
-### Font Selector
-```
-┌─────────────────────────────────────────────────────────┐
-│ Font Selection                                         │
-├─────────────────────────────────────────────────────────┤
-│ Font Family: [JetBrains Mono ▼]                       │
-│ Font Size: [10] [Reset]                               │
-│ Font Weight: [Normal ▼]                               │
-│ Font Style: [Normal ▼]                                │
-│                                                         │
-│ Preview: The quick brown fox jumps over the lazy dog   │
-│                                                         │
-│ [OK] [Cancel]                                          │
-└─────────────────────────────────────────────────────────┘
-```
-
-## System Integration
-
-### Windows Integration
-```cpp
-// Windows Settings integration
-class WindowsSettingsIntegration {
-public:
-    void register_with_settings();
-    void create_settings_page();
-    void handle_settings_changes();
-    
-private:
-    void add_to_windows_settings();
-    void create_registry_entries();
-    void register_protocol_handler();
-};
-```
-
-### macOS Integration
-```swift
-// macOS System Preferences integration
-class MacOSSettingsIntegration: NSObject {
-    func registerWithSystemPreferences()
-    func createPreferencesPane()
-    func handlePreferencesChanges()
-    
-    private func addToSystemPreferences()
-    func createPreferencePaneBundle()
-    func registerURLScheme()
-}
-```
-
-### Linux Integration
-```cpp
-// Linux desktop integration
-class LinuxDesktopIntegration {
-public:
-    void register_with_desktop();
-    void create_settings_app();
-    void handle_settings_changes();
-    
-private:
-    void add_to_gnome_settings();
-    void add_to_kde_settings();
-    void create_desktop_file();
-    void register_mime_types();
-};
-```
-
-## Configuration Management
-
-### Auto-Save and Validation
-```cpp
-class ConfigurationManager {
-public:
-    void auto_save_changes();
-    bool validate_configuration();
-    void backup_configuration();
-    void restore_configuration();
-    
-private:
-    void save_to_lua_files();
-    void validate_lua_syntax();
-    void create_backup();
-    void notify_user_of_changes();
-};
-```
-
-### Import/Export
-```cpp
-class ConfigurationIO {
-public:
-    bool import_configuration(const std::string& path);
-    bool export_configuration(const std::string& path);
-    bool import_from_other_wm(const std::string& wm_name);
-    
-private:
-    void parse_import_format();
-    void convert_to_srdwm_format();
-    void validate_imported_config();
-};
-```
-
-## Advanced Features
-
-### Live Preview
-- **Real-time updates**: Changes apply immediately
-- **Window preview**: See how windows will look
-- **Layout preview**: Visualize layout changes
-- **Theme preview**: Live theme switching
-
-### Configuration Sync
-- **Cloud sync**: Sync settings across devices
-- **Version control**: Track configuration changes
-- **Backup/restore**: Automatic configuration backups
-- **Migration tools**: Import from other window managers
-
-### Accessibility
-- **High contrast**: High contrast mode support
-- **Screen reader**: Full screen reader compatibility
-- **Keyboard navigation**: Complete keyboard navigation
-- **Large text**: Scalable interface elements
-
-## Installation and Distribution
-
-### Package Integration
-```bash
-# Linux (Debian/Ubuntu)
-sudo apt install srdwm-settings
-
-# Linux (Arch)
-sudo pacman -S srdwm-settings
-
-# Windows (Chocolatey)
-choco install srdwm-settings
-
-# macOS (Homebrew)
-brew install srdwm-settings
-```
-
-### System Integration
-```bash
-# Linux desktop files
-~/.local/share/applications/srdwm-settings.desktop
-
-# Windows registry
-HKEY_CURRENT_USER\Software\SRDWM\Settings
-
-# macOS preferences
-~/Library/Preferences/com.srdwm.settings.plist
-```
-
-## Development
-
-### Building the GUI
-```bash
-# Linux (GTK4)
-meson build -Dgui=true
-ninja -C build
-
-# Windows (WinUI 3)
-dotnet build src/gui/SRDWM.Settings.Windows
-
-# macOS (SwiftUI)
-xcodebuild -project src/gui/SRDWM.Settings.macOS.xcodeproj
-```
-
-### Testing
-```bash
-# Unit tests
-ninja -C build test
-
-# Integration tests
-ninja -C build integration-test
-
-# GUI tests
-ninja -C build gui-test
-```
-
-## User Experience
-
-### First Run Experience
-1. **Welcome dialog**: Introduction to SRDWM
-2. **Quick setup**: Essential settings configuration
-3. **Tutorial**: Interactive configuration guide
-4. **Import options**: Import from existing setups
-
-### Contextual Help
-- **Tooltips**: Hover for help text
-- **Help button**: Context-sensitive help
-- **Documentation**: Integrated user manual
-- **Examples**: Sample configurations
-
-### Error Handling
-- **Validation**: Real-time configuration validation
-- **Error messages**: Clear, actionable error messages
-- **Recovery**: Automatic error recovery
-- **Logging**: Detailed error logging
-
-This GUI settings program provides a professional, user-friendly interface that integrates seamlessly with existing system structures while maintaining the power and flexibility of the Lua configuration system.
-
-