refactor(client): replace host description consumers

apps/web/tests/agent-preset-authoring.overlay.yml

@@ -1,14 +1,12 @@
 # The authoring lane drives the location affordance. A real desktop open
 # would pop a file manager on the machine running the tests and the
 # capability itself is platform-detected (macOS yes, headless Linux CI no),
-# so the gateway is pinned headless: `hasDocument` is false everywhere and
+# so both native-open owners are pinned headless: `hasDocument` is false everywhere and
 # `openDocument` answers the directory as text — the same branch on every
 # host, and the one whose rendering a golden can hold. A patch replaces the
 # row's complete config, so the shipped routing defaults ride along.
-- id: api-gateway
+- id: session-controller
   config:
-    provider: deepseek-official
-    model: deepseek-v4-flash
     nativeOpen: false
 - id: settings-controller
   config:

apps/web/tests/produced-files.overlay.yml

@@ -1,7 +1,7 @@
 # The summary test asserts the native-folder action without launching it. Pin
 # the capability so headless Linux CI and desktop developer hosts expose the
 # same UI branch; platform opener behavior belongs to the Host unit tests.
-- id: api-gateway
+- id: session-controller
   config:
     nativeOpen: true
 - id: settings-controller