Reranking, filtering & knowing when to abstain

Pipeline lab: the fused list is a shortlist, not an answer. A cross-encoder over the top ten moves 24 first places to 26 out of 31 and almost all of it on typo'd codes, where the character feature separates E4O22 from E4021 at 0.4026 against 0.3226; the other three question kinds do not move. Then the bill. A filter applied after the LIMIT keeps 21 rows where a pre-filter returns 34, and org.bimlabz keeps 2 of its 8 live records with nothing in the response to say so. An abstention gate at 0.32 leaks 0 of 20 unanswerable questions and loses 5 of 31 answerable ones, two of them right answers. One of the five poisoned cases gets past every stage: E402Z is one edit from three live siblings that all score 0.4026.

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