non-write-users-check.yml uses gh without proper authentication fallback

Question

## Bug

.github/workflows/non-write-users-check.yml line 18 uses 'gh pr diff ... || true' to suppress errors. If gh is not authenticated or the PR doesn't exist, the diff will be empty and grep checks may silently pass.

non-write-users-check.yml uses gh without proper authentication fallback

Bug\n\n.github/workflows/non-write-users-check.yml line 18 uses 'gh pr diff ... || true' to suppress errors. If gh is not authenticated or the PR doesn't exist, the diff will be empty and grep checks may silently pass.