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/cordis/tool-cordis/src/api-catalog.ts

@@ -2099,7 +2099,7 @@ export const TYPE_API: readonly TypeApiEntry[] = [
   },
   {
     name: 'LlmConfigurableProvider',
-    declaration: 'export interface LlmConfigurableProvider {\n    provider: string;\n    displayName: string;\n    settingsNs: string;\n    settingsPath: readonly string[];\n}',
+    declaration: 'export interface LlmConfigurableProvider {\n    provider: string;\n    displayName: string;\n    settingsNs: string;\n    settingsPath: readonly string[];\n    declared?: boolean;\n}',
   },
   {
     name: 'LlmDiscoveredModel',