- Switch overrides from HashMap to BTreeMap — deterministic iteration by
type, drops the manual sort when logging.
- Rename the flat_map closure's inner `ips` to `addrs` to stop shadowing
the outer Vec<String>.
- Trim the Suite 8 TEST-NET-1 comment to keep the "why" and drop
mechanism narration.
- Drop a redundant sleep 1 after wait — wait already blocks on exit.