petite-ad WASM demo sketch

This static file documents the intended browser demo shape: compile a small wrapper crate with wasm-bindgen, expose graph construction and to_mermaid(), then render the Mermaid text in the browser.

flowchart LR
    n0["x: Input 0"]
    n1["y: Input 1"]
    n0 --> n2["Mul"]
    n1 --> n2