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. v1.9.0 implements `WebviewDispatch::print` (rasterizes the current frame to a PNG in the OS temp directory via tiny-skia's encoder) and makes `with_webview` succeed by invoking the user callback with a unit value (no native webview handle is available, but the closure can still run host-side bookkeeping). The Servo no-AI policy disqualifies upstream contribution; this is the AI-built parallel.