LabStrata: Sorted, with express lanes

Strata is a visual playground for the skip list, an ordered data structure that reaches O(log n) search, insert, and delete using randomised tower heights instead of tree rotations. The signature technique is the coin-flip level assignment that builds express lanes over the base list, with range queries layered on top and a 600-operation fuzz test against a reference set keeping it honest. It is a from-scratch, dependency-light build you can download and run locally.