Guided-auth removal, OAuth smoke testing, and TUI/CLI support (#1531)

* refactor(web): update OAuth E2E tests to use new authentication method

- Replaced `runGuidedAuth` with `authenticate` in the InspectorClient OAuth end-to-end tests to support quick authentication with CIMD pre-registration.
- Updated comments to reflect the change in authentication method and its support for HTTP test metadata URLs.
- Ensured that the tests continue to validate the expected authorization URL after the change.

Additionally, imported `ensureCimdClientRegistration` in the OAuthManager to streamline client registration during the authentication process.

* Guided-auth removal, OAuth smoke testing, and TUI/CLI support

* Added CLI OAuth runner flags tests

* Added clarifying comment on port 0 binding

* README notes on TUI oauth callback port, prettier fixes for CLI tests

* CIMD validation uses inline like EMA IdP

* Fixed TUI test failures from merge

* test: bring 5 OAuth files over the 90 per-file coverage gate

The guided-auth-removal work added/touched several files that fell below
the repo's >=90 per-file coverage gate (npm run coverage). CI doesn't run
the gate (it's local-only), so validate + test:integration passed while
these gaps slipped through. Bring them all back over the line:

- core/auth/node/runner-oauth-callback.ts: test bad-URL/non-http-scheme
  throws, no-port->80 default, and IPv6 hostname bracketing. Annotate the
  provably-dead guards (empty host, out-of-range port, String(err)
  fallback, pathname "/" fallback) -- all rejected by new URL() upstream --
  with justified v8 ignore comments instead of lowering the gate.
- core/auth/cimd.ts: test the AS-doesn't-support-CIMD early return.
- core/react/useClientSettingsDraft.ts: test the functional-updater path,
  the stale-onChange-after-close prev===null guard, and the
  timer-fires-after-close value===null guard.
- ClientSettingsForm.tsx: test the CIMD checkbox toggle and CIMD URL clear.
- clients/tui/src/utils/oauthDisplay.ts: test static/dcr registration
  kinds, the expired IdP session, and the configured-scope/empty-scope
  branches of formatScopes.

npm run coverage now passes (exit 0) across web, cli, tui, launcher.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Cursor <cursoragent@cursor.com>
Co-authored-by: cliffhall <cliff@futurescale.com>
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

clients/web/src/test/integration/mcp/remote/client-store-route.test.ts

@@ -99,6 +99,34 @@ describe("/api/storage/client keychain", () => {
     await teardown(h);
   });
 
+  it("POST persists EMA and CIMD together in client.json", async () => {
+    const body = {
+      enterpriseManagedAuth: {
+        enabled: true,
+        idp: {
+          issuer: "https://idp.example.com",
+          clientId: "inspector-app",
+        },
+      },
+      cimd: {
+        enabled: true,
+        clientMetadataUrl: "https://example.com/cimd.json",
+      },
+    };
+    const res = await fetch(`${h.baseUrl}/api/storage/client`, {
+      method: "POST",
+      headers: { "Content-Type": "application/json" },
+      body: JSON.stringify(body),
+    });
+    expect(res.status).toBe(200);
+
+    const onDisk = JSON.parse(
+      readFileSync(h.clientPath, "utf-8"),
+    ) as typeof body;
+    expect(onDisk.enterpriseManagedAuth).toEqual(body.enterpriseManagedAuth);
+    expect(onDisk.cimd).toEqual(body.cimd);
+  });
+
   it("POST writes IdP clientSecret to keychain, not client.json", async () => {
     const res = await fetch(`${h.baseUrl}/api/storage/client`, {
       method: "POST",