tauri-runtime-servocat 3.0.0

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. v3.0.0 makes zoom truly crisp: at present time the display list is scaled by `webview.zoom` (rect coords + stroke width + font_size), then re-rasterized via cosmic-text at the larger glyph size before being blitted to softbuffer. Text appears 2x larger at zoom=2.0 because the rasterizer actually rasterizes glyphs at 2x font_size, not because bitmap pixels are sample-replicated. The Servo no-AI policy disqualifies upstream contribution; this is the AI-built parallel.