ecma-runtime-cat 0.2.1

ECMAScript runtime: native built-ins (console, Math, JSON, parseInt, isNaN, ...) that the boa-cat engine exposes to scripts. v0.2.1 bumps to ecma-parse-cat 0.2 + boa-cat 0.3.1 so the shared AST types stay aligned across the workspace; no source changes since this crate doesn't itself parse user scripts and installs only data properties via the backward-compatible `Object::from_properties` / `Object::with` / `Object::get` / `Object::properties` APIs.