Reusable Quarto workflow startup-fails for callers without pages: read

The shared `.github/workflows/workspace-quarto-site.yml` added `pages: read` to its deploy job in ce205784, but existing workspace caller stubs (for example allenai/ai-for-science-survey `.github/workflows/docs.yml`) grant only `contents: write` and `pull-requests: write`. Every survey PR workflow since 2026-07-30 now fails at startup with zero jobs (example run https://github.com/allenai/ai-for-science-survey/actions/runs/30605541736).

Please restore compatibility by either removing the optional `pages: read` request from the reusable workflow (the script already has a canonical-URL fallback) or updating the workspace asset and all existing caller stubs to grant `pages: read`.