feat: establish unified administration and model context baseline

frontend/src/shell/PiManagement.test.tsx

@@ -149,7 +149,7 @@ test("shows the single-source host workflow in accessible platform tabs", async
   ]);
   for (const expected of [
     "deploy/<installation-id>/thothii-installation.yaml",
-    "modelCatalog.defaults.session",
+    "modelCatalog.defaults.interaction",
     "provider/model",
     "generated projections",
     "tht pi restart --yes --drain",
@@ -200,7 +200,7 @@ test("shows an explicit incomplete state when the catalog default is unavailable
 
   const incomplete = await screen.findByRole("alert", { name: "Pi configuration incomplete" });
   expect(incomplete).toHaveTextContent("The catalog default is unavailable");
-  expect(incomplete).toHaveTextContent("modelCatalog.defaults.session");
+  expect(incomplete).toHaveTextContent("modelCatalog.defaults.interaction");
   expect(screen.getByRole("button", { name: "Test catalog default" })).toBeDisabled();
 });