Proposal: StarlingMonkey Playground for JS-in-Wasm Components

I’m exploring how to improve the developer experience around WebAssembly components, specifically for JavaScript developers using StarlingMonkey and componentize-js. I’d like to propose a browser- or server-accessible playground that allows users to write JavaScript, compile it to a Wasm component, and execute it using StarlingMonkey.

#### Such a playground would:

- Allow JS developers to test and run JavaScript code as WebAssembly components without needing to set up a local toolchain.
- Demonstrate how StarlingMonkey integrates with WASI and the Component Model.
- Serve as an educational tool to visualize the WIT interface and component boundaries in real-time.

#### Proposed Features

- A simple UI for JS code input.
- Backend that compiles JS code into a component (via componentize-js or jco).
- Executes the component using Wasmtime + StarlingMonkey.
- Shows output from console.log, return values, or HTTP handlers.