tauri-runtime-servocat 2.1.0

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. v2.1.0 applies the webview's tracked zoom factor visually: the softbuffer compositor samples the rasterized frame with `1/zoom` step so `set_zoom(1.5)` makes each source pixel cover a 1.5x1.5 destination block (zoom in, top-left anchored). Bitmap nearest-neighbour scaling -- crisp re-rasterized text waits on a pipeline-side layout-with-scale-factor pass. The Servo no-AI policy disqualifies upstream contribution; this is the AI-built parallel.