test(server): reproduce Codex handoff failure after a run interrupted before provider start

Regression test for #23275. Fails on main with ContextHandoffBudgetError.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
cdc28c82a5Julius Marminge committed on 10/24/2026, 10:52:19 AMparent108ae35

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