Servo-replacement runtime for Tauri: wires html-cat, css-cat, dom-cat, layout-cat, paint-cat, net-cat, boa-cat, ecma-runtime-cat, and web-api-cat into a single rendering + scripting pipeline. v3.12.0 bumps `ecma-parse-cat = "0.1"` to `"0.2"` and `ecma-runtime-cat = "0.2"` to `"0.2.1"`, then re-resolves boa-cat to 0.3.1: end-user webview scripts can now write `{ get x() {} }` / `{ set x(v) {} }` / `{ foo() {} }` accessor and shorthand-method object-literal syntax, and the engine dispatches getter/setter invocations through the same path that web-api-cat's Rust-installed `document.cookie` accessor uses.