fix(auth): clear OAuth callback timer and reorder EMA scope persist

Clear the loopback callback timeout in runner-interactive-oauth finally
so already_authorized and error paths do not hang the CLI/TUI. Check EMA
step-up satisfaction against minted token scope before persisting the
requested union, matching the standard OAuth path.

Co-authored-by: Cursor <cursoragent@cursor.com>

clients/web/src/test/core/auth/runner-interactive-oauth.test.ts

@@ -84,6 +84,34 @@ describe("runRunnerInteractiveOAuth", () => {
     expect(client.completeOAuthFlow).not.toHaveBeenCalled();
   });
 
+  it("clears the callback timeout on already_authorized", async () => {
+    vi.useFakeTimers();
+    try {
+      const client = mockClient({
+        authenticate: vi.fn(async () => undefined),
+      });
+      const redirectUrlProvider = { redirectUrl: "" };
+
+      const result = await runRunnerInteractiveOAuth({
+        client,
+        redirectUrlProvider,
+        callbackListen: {
+          hostname: "127.0.0.1",
+          port: 6276,
+          pathname: "/oauth/callback",
+        },
+        callbackTimeoutMs: 60_000,
+        createCallbackServer: () => createMockCallbackServer(handlers),
+      });
+
+      expect(result).toEqual({ kind: "already_authorized" });
+      expect(vi.getTimerCount()).toBe(0);
+      await vi.advanceTimersByTimeAsync(60_000);
+    } finally {
+      vi.useRealTimers();
+    }
+  });
+
   it("completes connect-time OAuth via authenticate and callback", async () => {
     const redirectUrlProvider = { redirectUrl: "" };
     const client = mockClient({

clients/web/src/test/core/mcp/oauthManager.test.ts

@@ -1215,9 +1215,6 @@ describe("OAuthManager", () => {
     });
 
     it("returns satisfied for EMA insufficient_scope after user confirms", async () => {
-      const silentSpy = vi
-        .spyOn(emaFlow, "trySilentEmaAuth")
-        .mockResolvedValue({ status: "success" });
       const params = createMockParams({
         enterpriseManagedAuth: {
           idp: {
@@ -1237,6 +1234,14 @@ describe("OAuthManager", () => {
         token_type: "Bearer",
         scope: "mcp",
       });
+      const silentSpy = vi.spyOn(emaFlow, "trySilentEmaAuth").mockImplementation(async () => {
+        storageOf(params).getTokens.mockResolvedValue({
+          access_token: "tok",
+          token_type: "Bearer",
+          scope: "mcp weather:read",
+        });
+        return { status: "success" };
+      });
       const manager = new OAuthManager(params);
       manager.setOAuthConfig({ enterpriseManaged: true });
 
@@ -1257,6 +1262,51 @@ describe("OAuthManager", () => {
       silentSpy.mockRestore();
     });
 
+    it("does not persist union scope or return satisfied when silent EMA mint is down-scoped", async () => {
+      const silentSpy = vi
+        .spyOn(emaFlow, "trySilentEmaAuth")
+        .mockResolvedValue({ status: "success" });
+      const authUrl = new URL("https://idp.example.com/authorize?state=ema");
+      const startSpy = vi
+        .spyOn(emaFlow, "startEmaIdpAuthorization")
+        .mockResolvedValue(authUrl);
+      const params = createMockParams({
+        enterpriseManagedAuth: {
+          idp: {
+            issuer: "https://idp.example.com",
+            clientId: "app-client",
+            clientSecret: "secret",
+          },
+        },
+      });
+      storageOf(params).getScope.mockReturnValue("mcp");
+      storageOf(params).getTokens.mockResolvedValue({
+        access_token: "tok",
+        token_type: "Bearer",
+        scope: "mcp",
+      });
+      const manager = new OAuthManager(params);
+      manager.setOAuthConfig({ enterpriseManaged: true });
+
+      const outcome = await manager.handleAuthChallenge(
+        {
+          reason: "insufficient_scope",
+          requiredScopes: ["weather:read"],
+        },
+        { confirmedStepUp: true },
+      );
+
+      expect(outcome).toEqual(
+        expect.objectContaining({
+          kind: "interactive",
+          authorizationUrl: authUrl,
+        }),
+      );
+      expect(storageOf(params).saveScope).not.toHaveBeenCalled();
+      silentSpy.mockRestore();
+      startSpy.mockRestore();
+    });
+
     it("completeOAuthFlow mints EMA tokens with pending step-up union scope", async () => {
       const silentSpy = vi
         .spyOn(emaFlow, "trySilentEmaAuth")