test(agents): avoid provider runtime in fallback tests

src/agents/model-fallback.probe.test.ts

@@ -27,6 +27,10 @@ vi.mock("./auth-profiles/order.js", () => ({
   resolveAuthProfileOrder: vi.fn(),
 }));
 
+vi.mock("./provider-model-normalization.runtime.js", () => ({
+  normalizeProviderModelIdWithRuntime: () => undefined,
+}));
+
 vi.mock("./auth-profiles/source-check.js", () => ({
   hasAnyAuthProfileStoreSource: vi.fn(() => true),
 }));

src/agents/model-fallback.test.ts

@@ -32,6 +32,10 @@ vi.mock("../plugins/provider-runtime.js", () => ({
   resolveExternalAuthProfilesWithPlugins: () => [],
 }));
 
+vi.mock("./provider-model-normalization.runtime.js", () => ({
+  normalizeProviderModelIdWithRuntime: () => undefined,
+}));
+
 const authSourceCheckMock = vi.hoisted(() => ({
   hasAnyAuthProfileStoreSource: vi.fn(() => false),
 }));