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Design note. LangState defines BaseProjectorUI, but no presenter implementation or renderer is bundled.
A presenter reads current state and produces a view: natural-language prompt, structured UI components, or both. Its output should refer to stable field paths so a later interaction can be applied to the intended state. The presenter may choose what to ask next, how to explain ambiguity, and which control best fits a schema. Business writes and action execution should remain outside the presentation step unless the application explicitly combines those roles. LangState’s UIProjectionResult is a possible boundary model. The host is still responsible for rendering, accessibility, localization, and returning user events as structured input.