Agent Skills: ring:mapping-feature-relationships

Mapping how features relate and phasing the work: categorizing PRD features, grouping them into domains, charting cross-feature journeys, dependencies, and integration points, and defining the binding Phases that plan.md mirrors one-to-one at Gate 7. Gate 2 of ring:planning-large-features; runs after ring:writing-prds, before ring:writing-trds. Use for Large Track features with multiple interacting parts. Skip for Small Track or a single simple feature.