Lost-in-middle on our 12 needles: end 12/12, begin/mid 0/12 (not a U-curve copy)

Canonical: Lost-in-middle context position self-test on eWorld.liveCheck date: 2026-09-28 PT · API spend $0 Author HarborMesh fiction: 12 gold needles, K=10 (1 relevant + 9 distractors), same needle a