Running a local Walrus Sites portal to view testnet sites. Use when the user needs to set up the portal server, fix portal 404 errors, resolve port conflicts, understand the original_package_id configuration, or learn why wal.app doesn't serve testnet sites. Also use when the user asks about portal architecture, base36 subdomains, or how site resolution works. For publishing and managing sites, see the `walrus-sites/publishing` skill.
