A worked example of an extension: a jar with a manifest (META-INF/mindconnect/extension.json) that brings a tool (demo_dice), an agent (dungeon-master, seeded from initial-data), a runtime feature that decorates a core port and keeps a store of its own, and two screens — an adventure the agent runs as game master (/admin/demo-dungeon) and the dice statistics (/admin/demo-dungeon/stats). Not a dependency of any app — drop the jar on the admin UI's ...