cargo fmt --check (CI gate per AGENTS.md) flagged import-ordering +
line-wrapping drift across slice-2's committed code (rutster-tap,
rutster-tap-echo, rutster binary) that pre-dates slice-3. This worktree
branched from pivot-and-ui-design (which branched from main before
slice-1-review-fixes' fmt cleanup commit landed), so the drift is real
+ would break CI on the slice-3 branch. Purely cosmetic: alphabetical
use ordering, line wrapping under 100 cols. No semantic changes.
Mirrors the same fmt cleanup that slice-1-review-fixes applied.