The `volatile()` markers made the Host serve the namespace, and that was as
far as it went: the Plugins page does not build a card from a `Config` schema.
It draws only what browser halves register into the slots it declares, which is
why dsh-slopo, dsh-recall and dsh-context all ship a `client/` — and why this
plugin, with two served fields, still showed nothing.
The card registers into `plugins.bundle.config` while
`configForms.whileServed` reports the namespace served. The two keys are
deliberately different strings and that is the trap in the file: the settings
document is filed under the profile entry id (`facet-policy`) while the card is
keyed by the package name (`dsh-facet`). Every sibling plugin happens to name
them identically. Binding the form to the wrong one yields a card that renders,
saves, and writes nowhere, so `test/client.test.js` pins both, holds the card's
field list to the schema's volatile fields, and refuses to register at all when
the namespace is not served.
