test(mobile): drop the race helpers the surviving case no longer uses

Claude-Session: https://claude.ai/code/session_01JNnE9qzUZMMnqpZWCqM3nb

mobile/src/mobile-web/mobile-web-mutation-authorization-race.test.ts

@@ -5,7 +5,6 @@ import { MobileWebNativeChatAuthority } from './mobile-web-native-chat-authority
 import { MobileWebWorkspaceAuthority } from './mobile-web-workspace-authority'
 
 describe('mobile web mutation authorization races', () => {
-
   it('rejects native-chat persistence when the tab lookup loses its workspace authority', async () => {
     const workspace = workspaceAuthority()
     const chat = new MobileWebNativeChatAuthority((length) => new Uint8Array(length).fill(5))
@@ -76,11 +75,3 @@ function client(sendRequest: ReturnType<typeof vi.fn>): RpcClient {
 function success(result: unknown) {
   return { ok: true as const, result }
 }
-
-function failure() {
-  return { ok: false as const, error: { code: 'unexpected', message: 'unexpected' } }
-}
-
-function callsFor(sendRequest: ReturnType<typeof vi.fn>, method: string) {
-  return sendRequest.mock.calls.filter(([candidate]) => candidate === method)
-}

mobile/tsconfig.lane.json

@@ -1 +0,0 @@
-{ "extends": "./tsconfig.json", "compilerOptions": { "paths": { "@orca/expo-mobile-web-shell": ["./packages/expo-mobile-web-shell/src/index.ts"], "@orca/expo-mobile-web-shell/*": ["./packages/expo-mobile-web-shell/src/*"] } } }