game.player.interact — the one verb. Everything the player can act on in this city goes through here: a shop, a door, a car, a person to talk to, and the street arguments the whole game turns on. A slice does not implement its own prompt or its own key — it offers an interactable at a place and says what taking it does. WHY THIS EXISTS. The memory slice's street chains used to resolve on proximity: walking near the argument investigated it, and there was no way to walk past closer and choose not to. That is not a decision, it is a collision. Now a chain offers `INVESTIGATE` and the player presses the key or does not, which is the difference between a mechanic and a cutscene. Pure registry, no per-frame work: the `Interactor` component polls it.