Possible with GitHub Pages?

Imagine a pure client-only HTML/JS "GitHub Pages" app, e.g. https://microsoft.github.io/CSS-Exchange which is generated from https://github.com/microsoft/CSS-Exchange.

Is it possible to add copilot-sdk (or any AI feature) to such pure client-only HTML/JS "GitHub Pages" apps? Eventually, it is just Javascript that runs in the browser (client-side). Nothing is running/available at the server-side.
Not sure, how to communicate with Github Copilot CLI from javascript?

Start by reviewing the copilot-sdk documentation and the GitHub Copilot CLI integration points mentioned in the issue, then compare them with the constraints of a pure client-side GitHub Pages app. Define whether browser-only JavaScript can use the SDK or CLI directly, and document the supported integration path or the blocking limitation.

Written by the indexing model from the issue text.