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/button/README.md

@@ -0,0 +1,5 @@
+# llimphi-widget-button
+
+> Button with variants for [llimphi](../../README.md).
+
+Variants: `primary`, `secondary`, `ghost`, `danger`. Hover/active/disabled states. Supports icon + label, or icon-only.