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>

core/mcp/inspectorClientEventTarget.ts

@@ -39,7 +39,6 @@ import type { SamplingCreateMessage } from "./samplingCreateMessage.js";
 import type { ElicitationCreateMessage } from "./elicitationCreateMessage.js";
 import type { JsonValue } from "../json/jsonUtils.js";
 import type { OAuthTokens } from "@modelcontextprotocol/sdk/shared/auth.js";
-import type { OAuthStep, OAuthFlowState } from "../auth/types.js";
 
 /** Task with createdAt optional so we can emit synthetic tasks (e.g. on result/error) that omit it. */
 export type TaskWithOptionalCreatedAt = Omit<Task, "createdAt"> & {
@@ -146,11 +145,6 @@ export interface InspectorClientEventMap {
   // Session persistence (dispatched by client; FetchRequestLogState listens and saves)
   saveSession: { sessionId: string };
   // OAuth events (#1302 — fired by the ported oauthManager / InspectorClient)
-  oauthStepChange: {
-    step: OAuthStep;
-    previousStep: OAuthStep;
-    state: Partial<OAuthFlowState>;
-  };
   oauthComplete: { tokens: OAuthTokens };
   oauthAuthorizationRequired: { url: URL };
   oauthError: { error: Error };