- Add bin/yino-iso with download, build, and clean subcommands for
creating a preseeded Debian installer ISO
- Add --serial flag to bin/yino-vm boot for headless serial console
- Add offline installation ISO spec to FSD (section 6)
- Update README TODO to reflect ISO pipeline progress
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
