ec3c7c304c
ci / gate (push) Successful in 3m17s
Adds `cargo fmt --check` (stock defaults) to ci.yaml's gate, now that the
tree is rustfmt-clean (commit 41b7e9a). Records that reformat in
.git-blame-ignore-revs so `git blame` skips it. Amends ADR-ci-002 (the
deferred "revisit on main" fmt decision) + the ci ADR index.
Closes #35.