Function run_full_download

pub unsafe fn run_full_download<D: NetworkDriver>(
    device: &mut D,
    handoff: &'static BootHandoff,
    iso_url: Url,
) -> RunResult

Full integrated main loop with real state machines.

This is the production implementation that uses:

• VirtioNetDevice for networking
• smoltcp for TCP/IP
• IsoDownloadState for orchestration
• DiskWriterState for streaming writes