The mental model defines a step as one of a spec's ordered pieces, while the implement chapter also uses 'step' for the landing's sub-stages

The mental model defines a step as one of a spec's ordered pieces, while the implement chapter also uses 'step' for the landing's sub-stages

A terminology drift (severity nitpick) found by the cross-document consistency pass.

• End A: .abcd/development/brief/01-product/03-mental-model.md:56 — "A step is one of the ordered pieces a spec lists under its ## Steps section"
• End B: .abcd/development/brief/04-surfaces/27-implement.md:383 — "the head judged, the landing step it stopped before"

The mental model defines a step as one of the ordered pieces a spec lists under ## Steps, the unit that lands as one lane. The implement chapter uses the same word for the landing's own sub-stages ('the landing step it stopped before'), next to spec steps and the step verb's run moves. So 'step' carries a sense the defining document does not give it.

Evidence: .abcd/work/reviews/2026-10-26-consistency/00-summary.md, finding 82.