pluginsdk v0.2.7. The packer validates public_routes (reserved
prefixes, traversal, duplicates), requires an HTTP handler for routes
or sitemap, and stamps both into manifest.pb; codeless builds reject
them; writeMod round-trips the new plugin.mod keys so a version bump
cannot strip live route claims.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
