Plugins bundle pages and Discover entry pages show the plugin's long
description first, as Markdown with images, in a height-limited region
without its own heading. The document is the file locale meta.detail
names, otherwise the package README, otherwise (market entries only)
the declared repository's README.
The new dsh-plugin-detail library selects documents and reads local
package directories and npm file CDNs without state. plugin-manager
reads installed and offered bundles through readBundleDetail; plugin-market
reads market entries through readEntryDetail, single-file APIs, and a
size-limited partial clone cache serialized across processes. Raw HTML is
omitted, relative links stay text, and relative images load from Host
routes with a sandbox CSP.