Link the live ZERO.4 demo

Add the GitHub Pages browser demo and clarify that WebAssembly inference stays local.

README.md

@@ -24,6 +24,12 @@ This is a small research model with an intentionally narrow literary lineage,
 not a general-purpose assistant. Its unusual scale and inspectable runtime are
 the point.
 
+## Try it in your browser
+
+[Launch the live ZERO.4 demo on GitHub Pages](https://atimics.github.io/zero-grounded-literary-lm/).
+Inference runs locally in the browser through WebAssembly; prompts and generated
+text are not sent to a server.
+
 ## Files and integrity
 
 | File | Purpose |