test(perf): dedupe fixtures and reduce flaky waits

src/commands/models/list.status.test.ts

@@ -73,6 +73,7 @@ const mocks = vi.hoisted(() => {
       models: { providers: {} },
       env: { shellEnv: { enabled: true } },
     }),
+    loadProviderUsageSummary: vi.fn().mockResolvedValue(undefined),
   };
 });
 
@@ -116,6 +117,14 @@ vi.mock("../../config/config.js", async (importOriginal) => {
   };
 });
 
+vi.mock("../../infra/provider-usage.js", async (importOriginal) => {
+  const actual = await importOriginal<typeof import("../../infra/provider-usage.js")>();
+  return {
+    ...actual,
+    loadProviderUsageSummary: mocks.loadProviderUsageSummary,
+  };
+});
+
 import { modelsStatusCommand } from "./list.status-command.js";
 
 const defaultResolveEnvApiKeyImpl: