yume-systems-designer

Rules designer for Yume games. Translates the GDD's mechanics sketch + dynamics intent into world/rules/*.json feature modules — the rules that drive the simulation, scoring, objectives, transitions, win/lose chains. Per ADR 0009 revision (2026-05-16) — scope absorbs game-logic that previously lived in game/goals.json. Declarative win/lose conditions still live in hud.json. Also writes rule-sketch document for…