Remove npm package staging from repo checks (#39402)

## What changed

Remove the `repo-checks` steps that staged a Codex npm package from a fixed
release workflow and uploaded the resulting tarball as an artifact.

GitOrigin-RevId: bb3756188eeea2ed236710273234e70f17dc9e9d

.github/workflows/repo-checks.yml

@@ -48,33 +48,6 @@ jobs:
       - name: Install dependencies
         run: pnpm install --frozen-lockfile
 
-      - name: Stage npm package
-        id: stage_npm_package
-        env:
-          GH_TOKEN: ${{ github.token }}
-        run: |
-          set -euo pipefail
-          # Use a recent successful rust-release run that published the full
-          # cross-platform native payload required by the npm package layout.
-          # Passing the workflow URL directly avoids relying on old rust-v*
-          # branches remaining discoverable via `gh run list --branch ...`.
-          CODEX_VERSION=0.133.0-alpha.4
-          WORKFLOW_URL="https://github.com/openai/codex/actions/runs/26201494185"
-          OUTPUT_DIR="${RUNNER_TEMP}"
-          python3 ./scripts/stage_npm_packages.py \
-            --release-version "$CODEX_VERSION" \
-            --workflow-url "$WORKFLOW_URL" \
-            --package codex \
-            --output-dir "$OUTPUT_DIR"
-          PACK_OUTPUT="${OUTPUT_DIR}/codex-npm-${CODEX_VERSION}.tgz"
-          echo "pack_output=$PACK_OUTPUT" >> "$GITHUB_OUTPUT"
-
-      - name: Upload staged npm package artifact
-        uses: actions/upload-artifact@bbbca2ddaa5d8feaa63e36b76fdaad77386f024f # v7.0.0
-        with:
-          name: codex-npm-staging
-          path: ${{ steps.stage_npm_package.outputs.pack_output }}
-
       - name: Ensure root README.md contains only ASCII and certain Unicode code points
         run: ./scripts/asciicheck.py README.md
       - name: Check root README ToC