- cloudflare-pages-preview/README.md: add dedicated Required secrets section
listing the CF API token (with minimum permission scope) and account ID,
which inputs they map to, and a note that github-token needs no extra secret
- CLAUDE.md: make Required secrets a mandatory README section for new actions
- README.md: list actions in a table with separate rows for deploy/cleanup
- CLAUDE.md: conventions for adding new composite actions (layout, shell
requirement, env-var input passing, secrets, github-token, README
requirements, validation)
