ci(release): stop passing release-shared app secrets to actor guard

The release actor guard no longer requires RELEASE_BOT_* secrets (it can fall back to repo-admin authorization).\n\nAvoid passing app_id/private_key from release.yml to reduce secret exposure and satisfy secret-hardening contracts.

Author: leeroybrun

.github/workflows/release.yml

@@ -176,8 +176,6 @@ jobs:
         uses: ./.github/actions/release-actor-guard
         with:
           team_slug: release-admins
-          app_id: ${{ secrets.RELEASE_BOT_APP_ID }}
-          private_key: ${{ secrets.RELEASE_BOT_PRIVATE_KEY }}
 
   gate:
     name: CI Gate (dev)