Add CLAUDE.md for Claude Code guidance

AGENTS.md

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+# AGENTS.md
+
+This file provides guidance to AI coding assistants when working with code in this repository.
+
+## Project Overview
+
+Slint is a declarative GUI toolkit for building native user interfaces across embedded systems, desktops, mobile, and web platforms. UIs are written in `.slint` markup files and connected to business logic in Rust, C++, JavaScript, or Python.
+
+## Build Commands
+
+### Rust (Primary)
+```sh
+cargo build                                    # Build the workspace
+cargo build --release                          # Release build
+cargo test                                     # Run tests (requires cargo build first!)
+cargo build --workspace --exclude uefi-demo --release  # Build all examples
+```
+
+### Running Examples
+```sh
+cargo run --release -p gallery                 # Run the gallery example
+cargo run --release --bin slint-viewer -- path/to/file.slint  # View a .slint file
+```
+
+### C++ Build
+```sh
+cargo build --lib -p slint-cpp                 # Build C++ library
+mkdir cppbuild && cd cppbuild
+cmake -GNinja ..
+cmake --build .
+```
+
+### Node.js Build
+```sh
+cd api/node && pnpm install
+```
+
+## Testing
+
+**Important**: Run `cargo build` before `cargo test` - the dynamic library must exist first.
+
+### Test Drivers
+```sh
+cargo test -p test-driver-interpreter         # Fast interpreter tests
+cargo test -p test-driver-rust                # Rust API tests
+cargo test -p test-driver-cpp                 # C++ tests (build slint-cpp first)
+cargo test -p test-driver-nodejs              # Node.js tests
+cargo test -p doctests                        # Documentation snippet tests
+```
+
+### Filtered Testing
+```sh
+SLINT_TEST_FILTER=layout cargo test -p test-driver-rust  # Filter by name
+```
+
+### Syntax Tests (Compiler Errors)
+```sh
+cargo test -p i-slint-compiler --features display-diagnostics --test syntax_tests
+SLINT_SYNTAX_TEST_UPDATE=1 cargo test -p i-slint-compiler --test syntax_tests  # Update expected errors
+```
+
+### Screenshot Tests
+```sh
+cargo test -p test-driver-screenshots                    # Compare against references
+SLINT_CREATE_SCREENSHOTS=1 cargo test -p test-driver-screenshots  # Generate references
+```
+
+## Architecture
+
+### Core Components
+
+- **`internal/compiler/`** - Slint language compiler (lexer, parser, code generators)
+  - `parser/` - .slint syntax parsing using Rowan
+  - `passes/` - Optimization passes
+  - `generator/` - Code generators for C++, Rust, Python, JS
+  - `tests/syntax/` - Syntax error test cases
+
+- **`internal/core/`** - Runtime library (properties, layout, animations, accessibility)
+
+- **`internal/core-macros/`** - Procedural macros for i-slint-core
+
+- **`internal/common/`** - Shared code and data structures between compiler and runtime
+
+- **`internal/interpreter/`** - Dynamic compilation for scripting languages
+
+- **`internal/backends/`** - Platform windowing/input:
+  - `winit/` - Cross-platform (primary)
+  - `qt/` - Qt integration
+  - `android-activity/` - Android platform support
+  - `linuxkms/` - Linux KMS/DRM direct rendering
+  - `selector/` - Runtime backend selection
+  - `testing/` - Testing backend for automated tests
+
+- **`internal/renderers/`** - Rendering engines:
+  - `femtovg/` - OpenGL ES 2.0
+  - `skia/` - Skia graphics
+  - `software/` - CPU-only fallback
+
+### Language APIs (`api/`)
+
+- `rs/slint/` - Rust public crate
+- `rs/macros/` - `slint!` procedural macro
+- `rs/build/` - Build script support
+- `cpp/` - C++ API with CMake integration
+- `node/` - Node.js bindings (Neon)
+- `python/` - Python bindings (PyO3)
+- `wasm-interpreter/` - WebAssembly bindings for browser use
+
+### Tools
+
+- `tools/lsp/` - Language Server Protocol for editor integration
+- `tools/compiler/` - CLI compiler
+- `tools/viewer/` - .slint file viewer with hot reload
+- `tools/slintpad/` - Web-based Slint editor/playground
+- `tools/figma_import/` - Import designs from Figma
+- `tools/tr-extractor/` - Translation string extractor for i18n
+- `tools/updater/` - Migration tool for Slint version updates
+
+### Editor Support (`editors/`)
+
+- `vscode/` - Visual Studio Code extension
+- `zed/` - Zed editor integration
+- `kate/` - Kate editor syntax highlighting
+- `sublime/` - Sublime Text support
+- `tree-sitter-slint/` - Tree-sitter grammar for syntax highlighting
+
+### Key Patterns
+
+- Internal crates (`internal/`) are not semver-stable - they use exact version pinning
+- FFI modules are gated with `#[cfg(feature = "ffi")]`
+- C++ headers generated via `cargo xtask cbindgen`
+- Extensive Cargo features control renderers (`renderer-femtovg`, `renderer-skia`, `renderer-software`) and backends (`backend-winit`, `backend-qt`)
+
+## Code Style
+
+- Rust: `rustfmt` enforced in CI
+- C++: `clang-format` enforced in CI
+- Linear git history preferred (rebase/squash merges)
+
+## Platform Prerequisites
+
+### Linux
+```sh
+# Debian/Ubuntu
+sudo apt install libxcb-shape0-dev libxcb-xfixes0-dev libxkbcommon-dev \
+  libfontconfig-dev libssl-dev clang libavcodec-dev libavformat-dev \
+  libavutil-dev libavfilter-dev libavdevice-dev libasound2-dev pkg-config
+```
+
+### macOS
+```sh
+xcode-select --install
+brew install pkg-config ffmpeg
+```
+
+### Windows
+- Enable symlinks: `git clone -c core.symlinks=true https://github.com/slint-ui/slint`
+- Install MSVC Build Tools
+- FFMPEG via vcpkg or manual installation