Tests reproduce #23050: forking a Pi thread at an earlier turn fails with 'Pi turn 2 has no captured session-tree entry' while the next turn is still running. Red only; no implementation. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Julius Marminge committed on 10/21/2026, 7:32:16 PMparentd27c606
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