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PR #1495 adds an autofix.ci GitHub Actions workflow. It runs cargo fmt --all on every pull request and hands the resulting diff to autofix.ci, which commits any formatting fixes directly onto the PR branch. Formatting failures no longer bounce a PR back to the author for a manual cargo fmt round trip.

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What changes for contributors

  • You no longer need to run cargo fmt before pushing. If your branch has formatting drift, autofix.ci pushes a fix-up commit to it within a few minutes of the workflow run.
  • After autofix.ci commits to your branch, pull before pushing again to avoid a non-fast-forward rejection.
  • The workflow uses the same pinned nightly toolchain as the Format Check gate in CI, so the fixer and the gate never disagree on formatting.

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What stays manual

Only rustfmt is automated, because it is deterministic and never changes semantics. Everything else remains a human-reviewed gate:
  • Clippy. clippy --fix can rewrite logic, so clippy findings still fail CI and require a manual fix.
  • Generated artifacts. Whatspec regeneration checks stay human-reviewed and are never auto-committed.
  • Bartender image pins. Pin updates stay human-reviewed.
The workflow runs with read-only repository permissions. The commit-back step goes through the autofix.ci GitHub App rather than a repository token.