Checkpoint — Break It Yourself

Checkpoint — Break It Yourself. Strict majority (> n/2) is a one-pass count with a strict comparison. The W embodies the two adversarial shapes from this module: the tie assumption (mode must be the majority — false under ties) and the boundary stumble (>= instead of >, flipping the exactly-half case to a false YES). The tests are the shapes, made explicit: exact-half and tie-storm. When you can predict which tests will kill a plausible solution before running it, the adversarial skill has arrived.