The formatting job's git push command failed when GitHub Actions couldn't determine the default push target.

Changes

• Updated .github/workflows/rust.yml line 63 to explicitly specify target branch:

  # Before
  git push
  
  # After  
  git push origin HEAD:${{ github.ref_name }}

Uses GitHub Actions' github.ref_name context variable to push to the correct branch in all workflow contexts (push, PR, workflow_dispatch).

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