Revert temporary Grok PR lockfile CI hack

.github/workflows/pr.yml

@@ -27,12 +27,6 @@ jobs:
           # do not masquerade as changes made by the PR itself.
           changed="$(git diff --name-only "${{ github.event.pull_request.base.sha }}...${{ github.event.pull_request.head.sha }}")"
           if printf '%s\n' "$changed" | grep -qx 'pnpm-lock.yaml'; then
-            # Temporary branch-scoped exception to let CI exercise the Grok adapter
-            # PR with a lockfile diff. Revert this after the branch is validated.
-            if [ "${{ github.head_ref }}" = "PAPA-341-create-grok-build-adapter" ]; then
-              echo "Temporarily allowing pnpm-lock.yaml for ${GITHUB_HEAD_REF}."
-              exit 0
-            fi
             echo "Do not commit pnpm-lock.yaml in pull requests. CI owns lockfile updates."
             exit 1
           fi