test(server): consolidate oversized handoff deferral coverage

Co-Authored-By: GPT-6.1-Sol at high effort <noreply@openai.com>
Co-Authored-By: GPT-6.1-Sol at xhigh effort, review subagent for PR 19414 maintenance rebase <noreply@openai.com>
401162e84eJulius Marminge committed on 10/19/2026, 6:37:31 PM· committed by Alb11747parent7de8daf
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