Migrate to Bevy 0.18 (#13)

* update: enable message loop work for Windows and Linux

* update: upgrade Bevy to version 0.18 and adjust asset loader for path handling

* update: rename bevy_picking to picking in Cargo.toml

* update: remove pull_request trigger from CI and change AmbientLight to GlobalAmbientLight

* update: remove demo example from workspace and exclude it from tests

* update: remove demo package from Cargo.lock

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Co-authored-by: not-elm <elmgameinfo@gmail.com>

AGENTS.md

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+# Repository Guidelines
+
+## Project Structure & Module Organization
+- `src/`: Public `bevy_cef` crate API surface.
+- `crates/bevy_cef_core`: Core CEF integration and IPC.
+- `crates/bevy_cef_debug_render_process`: Debug render-process tool.
+- `examples/`: Runnable samples (e.g., `simple.rs`, `js_emit.rs`, `brp.rs`).
+- `assets/`: Local HTML/CSS/JS served via `cef://localhost/`.
+- `docs/`: Supporting documentation.
+
+## Build, Test, and Development Commands
+- `cargo build --features debug`: Build with macOS debug tooling enabled.
+- `cargo run --example simple --features debug`: Run a basic webview example.
+- `cargo test --workspace --all-features`: Run tests (currently no automated tests; validates compilation).
+- `make fix`: Run `cargo clippy --fix` and `cargo fmt --all`.
+- `make install`: Install and copy the debug render process into the CEF framework (macOS).
+
+## Coding Style & Naming Conventions
+- Rust 2024 edition; format with `cargo fmt` before committing.
+- Lint with `cargo clippy` (see `make fix`).
+- Naming: `snake_case` for modules/functions/files, `CamelCase` for types/traits, `SCREAMING_SNAKE_CASE` for constants.
+- Prefer small, focused modules; keep public API in `src/` and implementation in `crates/`.
+
+## Testing Guidelines
+- No dedicated test suite yet; rely on examples for manual verification.
+- Use `examples/` to validate features (IPC, navigation, zoom, devtools).
+- If adding tests, keep names descriptive (e.g., `test_ipc_roundtrip`) and run with `cargo test --workspace --all-features`.
+
+## Commit & Pull Request Guidelines
+- Commit subjects are short, imperative; common prefixes include `add:`, `fix:`, `update:`, `remove:`.
+- Include PR or issue references when relevant (e.g., `Support Bevy 0.17 (#11)`).
+- PRs should describe changes, testing performed, and target platform (macOS/Windows/Linux).
+- For webview or UI changes, include screenshots or short clips when possible.
+
+## Platform & Configuration Notes
+- Primary development target is macOS; CEF framework should exist at `$HOME/.local/share/cef`.
+- Local assets are served as `cef://localhost/<file>`; prefer `CefWebviewUri::local("file.html")`.