Add CMake build system

.claude/skills/build-cmake/SKILL.md

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+---
+name: build-cmake
+description: Build an iPlug2 plugin project using CMake (Ninja or Xcode generator)
+---
+
+# Build iPlug2 Plugin with CMake
+
+Use this skill when the user wants to build their plugin project using CMake.
+
+## Workflow
+
+1. **Identify the project:**
+   - Look for `CMakeLists.txt` in project directories
+
+2. **Choose a preset** based on platform and build requirements
+
+## Using CMake Presets
+
+The project uses CMake presets for standardized builds. Prefer `--preset` instead of manual `-G` flags.
+
+### List Available Presets
+
+```bash
+cmake --list-presets
+```
+
+### macOS Builds
+
+```bash
+# Configure with Ninja (fast builds)
+cmake --preset macos-ninja -S [ProjectName]
+
+# Build
+cmake --build build/macos-ninja --target [ProjectName]-app
+
+# Or with Xcode (for debugging)
+cmake --preset macos-xcode -S [ProjectName]
+cmake --build build/macos-xcode --config Release --target [ProjectName]-app
+
+# Universal binary (arm64 + x86_64)
+cmake --preset macos-xcode-universal -S [ProjectName]
+cmake --build build/macos-xcode-universal --config Release
+```
+
+### iOS Builds
+
+```bash
+# iOS Device
+cmake --preset ios-xcode -S [ProjectName]
+cmake --build build/ios-xcode --config Release
+
+# iOS Simulator
+cmake --preset ios-sim-xcode -S [ProjectName]
+cmake --build build/ios-sim-xcode --config Release
+```
+
+For running in Simulator, use the `run-ios-simulator` skill.
+
+### visionOS Builds
+
+```bash
+# visionOS Device
+cmake --preset visionos-xcode -S [ProjectName]
+cmake --build build/visionos-xcode --config Release
+
+# visionOS Simulator
+cmake --preset visionos-sim-xcode -S [ProjectName]
+cmake --build build/visionos-sim-xcode --config Release
+```
+
+### Windows Builds
+
+```bash
+# Visual Studio 2022 (x64)
+cmake --preset windows-vs2022 -S [ProjectName]
+cmake --build build/windows-vs2022 --config Release
+
+# ARM64EC
+cmake --preset windows-vs2022-arm64ec -S [ProjectName]
+cmake --build build/windows-vs2022-arm64ec --config Release
+```
+
+### Web/WAM Build (Emscripten)
+
+```bash
+# Configure (requires EMSDK environment)
+cmake --preset wam -S [ProjectName]
+
+# Build
+cmake --build build/wam --target [ProjectName]-wam
+
+# Create distribution
+cmake --build build/wam --target [ProjectName]-wam-dist
+```
+
+Output in `build/wam/out/[ProjectName]-wam/`
+
+## Available Configure Presets
+
+| Preset | Platform | Generator | Description |
+|--------|----------|-----------|-------------|
+| `macos-ninja` | macOS | Ninja | Fast command-line builds (NanoVG/Metal) |
+| `macos-make` | macOS | Make | Unix Makefiles (NanoVG/Metal) |
+| `macos-xcode` | macOS | Xcode | IDE builds with debugging |
+| `macos-xcode-universal` | macOS | Xcode | Universal binary (arm64+x86_64) |
+| `ios-xcode` | iOS | Xcode | iOS device builds |
+| `ios-sim-xcode` | iOS | Xcode | iOS Simulator builds |
+| `visionos-xcode` | visionOS | Xcode | visionOS device builds |
+| `visionos-sim-xcode` | visionOS | Xcode | visionOS Simulator builds |
+| `windows-ninja` | Windows | Ninja | Fast Windows command-line builds |
+| `windows-vs2022` | Windows | VS2022 | Windows x64 builds |
+| `windows-vs2022-arm64ec` | Windows | VS2022 | Windows ARM64EC builds |
+| `wam` | Web | Ninja | Emscripten/WebAssembly builds |
+
+## Available Targets
+
+- `[ProjectName]-app` - Standalone application
+- `[ProjectName]-vst3` - VST3 plugin
+- `[ProjectName]-au` - Audio Unit (AUv2)
+- `[ProjectName]-clap` - CLAP plugin
+- `[ProjectName]AU-framework` - AUv3 framework
+- `[ProjectName]AUv3-appex` - AUv3 app extension
+- `[ProjectName]-ios-app` - iOS standalone app
+- `[ProjectName]-wam` - Web Audio Module
+
+## Graphics Backend and Renderer
+
+Default configuration uses NanoVG with Metal (macOS/iOS) or GL2 (Windows).
+
+To use Skia backend, add cache variables:
+
+```bash
+cmake --preset macos-ninja -S [ProjectName] \
+  -DIGRAPHICS_BACKEND=SKIA \
+  -DIGRAPHICS_RENDERER=METAL
+```
+
+Valid combinations:
+- **NanoVG**: GL2, GL3, METAL
+- **Skia**: GL3, METAL, CPU
+
+**Note:** Skia requires prebuilt libraries:
+```bash
+./iPlug2/Dependencies/download-prebuilt-libs.sh mac
+```
+
+## Build Locations (symlinked on macOS)
+
+- APP: `~/Applications/[ProjectName].app`
+- VST3: `~/Library/Audio/Plug-Ins/VST3/`
+- AU: `~/Library/Audio/Plug-Ins/Components/`
+- CLAP: `~/Library/Audio/Plug-Ins/CLAP/`
+
+## Clean Build
+
+```bash
+# Remove build directory and reconfigure
+rm -rf build/macos-ninja
+cmake --preset macos-ninja -S [ProjectName]
+```
+
+## Example
+
+```bash
+# Quick build of standalone app
+cmake --preset macos-ninja -S MySynth
+cmake --build build/macos-ninja --target MySynth-app
+
+# Open the built app
+open ~/Applications/MySynth.app
+
+# Build for iOS Simulator
+cmake --preset ios-sim-xcode -S MySynth
+cmake --build build/ios-sim-xcode --config Release
+```