docs: explain deferred oversized handoffs

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>
2741518550Julius Marminge committed on 10/19/2026, 6:37:45 PM· committed by Alb11747parentd41b6f1

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