Harden Turntable review workflow - #1

No actionable issues found.

The change looks sound. The PR hardens the Turntable review workflow by tightening permissions and adding explicit checkout steps, and the modifications across the workflow file are consistent with that intent. The added job-level permissions: block adopts the principle of least privilege by defaulting to contents: read, and each subsequent job declares only the scopes it actually needs (issues for label management, pull-requests for comment/reaction posting, contents for checkout), which is the recommended pattern for GitHub Actions security. The introduction of actions/checkout@v4 with a pinned commit SHA is a good defensive choice given recent supply-chain concerns around the action, and it makes the run reproducible.

The label-driven gating logic (labels: turntable-review-requested) and the conditional if: checks on the apply/reply jobs ensure that bot activity is scoped to PRs the maintainers have explicitly opted into, avoiding noisy or accidental comments on unrelated work. The job dependency chain (needs: [enqueue, label]) is reasonable and prevents the reply job from racing ahead of label application.

No issues were identified during review. The change is small, focused, and improves the security posture of the workflow without introducing functional regressions. Merging should be safe; future hardening opportunities (if desired) would include adding permissions: {} at the workflow top level to force every job to declare its own scopes, and pinning the remaining third-party actions by commit SHA, but these are enhancements rather than required fixes.