dotslash: publish Codex entrypoints from package archives (#23638)

## Summary

DotSlash should resolve the same canonical package archives used by
standalone installers and npm platform packages, rather than continuing
to point at single-binary zstd artifacts or the older Linux bundle
archive.

This updates the Codex CLI and `codex-app-server` DotSlash release
config entries to match `codex-package-<target>.tar.gz` and
`codex-app-server-package-<target>.tar.gz`, with paths that select
`bin/codex` or `bin/codex-app-server` inside the extracted package. The
other helper outputs stay on their existing per-binary artifacts for
now.

## Test plan

- `python3 -m json.tool .github/dotslash-config.json > /dev/null`
- Ran a Python regex smoke test that checked every updated `codex` and
`codex-app-server` platform entry against the archive names emitted by
`.github/scripts/build-codex-package-archive.sh`.

.github/workflows/rust-release-windows.yml

@@ -220,6 +220,9 @@ jobs:
               "$dest/${binary}-${{ matrix.target }}.exe"
           done
 
+      - name: Install DotSlash
+        uses: facebook/install-dotslash@1e4e7b3e07eaca387acb98f1d4720e0bee8dbb6a # v2
+
       - name: Build Codex package archives
         shell: bash
         run: |
@@ -274,9 +277,6 @@ jobs:
           path: python-runtime-dist/${{ matrix.target }}/*.whl
           if-no-files-found: error
 
-      - name: Install DotSlash
-        uses: facebook/install-dotslash@1e4e7b3e07eaca387acb98f1d4720e0bee8dbb6a # v2
-
       - name: Compress artifacts
         shell: bash
         run: |
@@ -295,7 +295,7 @@ jobs:
             base="$(basename "$f")"
             # Skip files that are already archives (shouldn't happen, but be
             # safe).
-            if [[ "$base" == *.tar.gz || "$base" == *.zip || "$base" == *.dmg ]]; then
+            if [[ "$base" == *.tar.gz || "$base" == *.tar.zst || "$base" == *.zip || "$base" == *.dmg ]]; then
               continue
             fi