ci / rust (push) Failing after 1m58s
`cargo fmt --all -- --check` was already failing on `main` (CI run 149) due to unformatted code in broker.rs and http.rs; e2e.rs carried the same drift. This applies rustfmt to those three so the branch passes the fmt gate. No behavior change. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>