Two composite actions extracted from modelcontextprotocol's blog-preview workflow:
- deploy: injects noindex headers/meta, deploys to CF Pages under a per-PR
branch alias, posts/updates a sticky PR comment with preview URLs
- cleanup: deletes all CF Pages deployments for the PR branch alias on close,
updates the sticky comment
Callers provide a pre-built static HTML directory; the actions handle
everything Cloudflare-specific.
