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`.

Start with .github/workflows/workspace-quarto-site.yml and compare its pages: read request with the existing caller stub, such as allenai/ai-for-science-survey/.github/workflows/docs.yml. Inspect the other existing caller stubs and the referenced workflow run to confirm the startup failure. Done means affected survey PR workflows start successfully with jobs instead of failing before execution.

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