README: the engine is the flux-klein.js npm package

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01DGtw9KfFunZUshHNBE9jSq

README.md

@@ -16,7 +16,16 @@ hand-written WGSL (WebGPU), the distilled text encoder and BFL's distilled VAE t
 onnxruntime-web. The page streams these files straight into the browser and keeps them in the
 origin private file system, so a second visit starts in seconds.
 
-This repo holds **weights only**. The engine, the demo page and its build live in the Space.
+This repo holds **weights only**. The engine is the
+[flux-klein.js](https://github.com/radames/flux-klein.js) npm package (the WGSL transformer, the
+ONNX text encoder and VAE, the OPFS cache); the demo page lives in the Space. The package fetches
+from this repo by default:
+
+```js
+import { createFluxKlein } from "flux-klein.js";
+const klein = await createFluxKlein(); // base: https://huggingface.co/radames/flux2-klein-edge-web/resolve/main
+const { rgba, width, height } = await klein.generate({ prompt: "a red bicycle", width: 256, height: 256 });
+```
 
 ## Layout