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Beam search: backtrace follows pre-prune beam slots · case 03

backtrace follows pre-prune beam slots.

Member previewVariant 3 · 3 implementations · 6 checks per implementation

Case contract

At each layer, parent_ids names prior hypotheses and selected contains indices into that array; return token paths by following indices from final nodes.

Why this case matters

Beam decoders rely on consistent hypothesis state while expanding and ranking candidates.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
crossed ancestry	`[["a", "d"]]`	`[["b", "c"]]`	Failed

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