feat: llimphi standalone — framework UI soberano extraído del monorepo

Motor gráfico Llimphi como workspace independiente: bucle Elm
(input→update→view→layout→raster→present) sobre wgpu+vello+taffy+parley.
Núcleo (hal/raster/layout/text/ui/theme/surface/motion/icons) + ~40 widgets
+ módulos, sin dependencias al resto del monorepo. cargo check --workspace
pasa (64 crates). Puerta de entrada: cargo run -p llimphi-ui --example counter.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

widgets/gallery/README.md

@@ -0,0 +1,5 @@
+# llimphi-widget-gallery
+
+> Virtualized card grid for [llimphi](../../README.md).
+
+Responsive layout with auto-fit columns; each card is a free `View<Msg>`. Reuses [`card`](../card/README.md).