test(e2e): drop unused cohortEmail import (code-quality bot)

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

Author: mastermanas805

e2e/live-writes.spec.ts

@@ -53,7 +53,6 @@ import { gzipSync } from 'node:zlib'
 import { expect, test, type APIRequestContext, type APIResponse } from '@playwright/test'
 
 import {
-  cohortEmail,
   cohortName,
   COHORT_MARKER,
   isCohortBranded,