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Fabric and NeoForge. Completes #14, thanks to @filiphsps. ### Added - Generic screen control for the client (#14): `get_ui` lists the widgets of the open screen, `click_widget` clicks one by id or label and `set_text_field` types into a text field. New capability group `ui` behind the new `enableUiControl` flag, which is off by default and also needs `enablePlayerControl`. Vanilla screens are limited to the pause, title, death, options, advancements, statistics, confirmation and container screens; the world, server, chat, link, LAN, online options, player report, resource pack and command block screens are refused, and so are the Quit Game, Realms and Reset Demo World buttons. ### Changed - Every MCP tool now states all four hints (`readOnlyHint`, `destructiveHint`, `idempotentHint`, `openWorldHint`), so clients no longer assume the spec defaults (destructive, non-idempotent, open world) for tools that only move the player or set input. Tools that reach other players (`send_chat`, `message_player`, `kick_player`, `run_command`, `join_world`) are marked open-world.