feat(ui-models): tag the provider rows this deployment declared

A row's stored profile could not tell a hand-declared gateway from a
shipped provider whose models someone narrowed — both look identical from
outside the adapter — so the Models page had no way to mark the routes a
deployment added itself.

The directory entry now carries `declared`, answered by the owning adapter
against its own installed catalog, and the page renders a Custom tag from
it. Absence stays "this adapter draws no such distinction" rather than
"shipped", so a route no adapter claims is labelled neither way.

Also records the default-route work's Agent Note and the e2e evidence for
all three changes: the composer switch writing the section, and the Models
page declaring a route with its own reasoning effort.

packages/client/ui-models/src/client/ModelsSection.module.css

@@ -72,6 +72,20 @@
   color: var(--dsw-alias-label-primary);
 }
 
+/* Reads as an annotation on the name, not as a second name: caption size and
+   the secondary label tone, so it never competes with the row's own title.
+   `rowActions` keeps the `margin-left: auto`, which is what holds the tag
+   beside the name instead of letting it drift across the row. */
+.rowTag {
+  flex: none;
+  padding: 1px 6px;
+  border: 1px solid var(--dsw-alias-border-l3);
+  border-radius: 4px;
+  font-size: 11px;
+  line-height: 16px;
+  color: var(--dsw-alias-label-secondary);
+}
+
 .rowActions {
   display: inline-flex;
   align-items: center;

packages/client/ui-models/src/client/ModelsSection.tsx

@@ -205,6 +205,12 @@ function Loaded({ injected }: { injected: ModelsSectionInjected }): ReactNode {
             <li key={row.entry.provider} className={styles['rowCard']}>
               <div className={styles['rowHead']}>
                 <span className={styles['rowName']}>{row.entry.displayName}</span>
+                {/* Only the adapter can tell a hand-declared route from a
+                    shipped one it also has a stored profile for, so the tag
+                    follows its answer and stays off when it gives none. */}
+                {row.entry.declared === true
+                  ? <span className={styles['rowTag']}>{t('customTag')}</span>
+                  : null}
                 <span className={styles['rowActions']}>
                   <button
                     type="button"

packages/client/ui-models/src/client/locales.ts

@@ -65,6 +65,7 @@ export const en = {
   fetchAdopt: 'Add selected',
   customAdd: 'Add a custom provider',
   customTitle: 'Custom provider',
+  customTag: 'Custom',
   customRoute: 'Provider ID',
   customRouteHint: 'Lowercase identifier that uniquely names this provider in requests and as its credential name.',
   customRouteInvalid: 'Use lowercase letters, digits, and dashes.',
@@ -149,6 +150,7 @@ export const zh: typeof en = {
   fetchAdopt: '添加所选',
   customAdd: '添加自定义提供方',
   customTitle: '自定义提供方',
+  customTag: '自定义',
   customRoute: 'Provider ID',
   customRouteHint: '小写标识，在请求中唯一标识该提供方，并用于派生凭据名。',
   customRouteInvalid: '只能使用小写字母、数字和短横线。',