Function github_device_flow 

pub async fn github_device_flow(
    client: &Client,
    out: &Output,
) -> Result<GithubAuth>

Runs the GitHub Device Flow (RFC 8628) to authenticate the user.

Args:

• client: Pre-configured HTTP client from the composition root.
• out: Output helper for progress messages.

Usage:

let auth = github_device_flow(&client, &out).await?;
println!("Authenticated as {}", auth.username);