First visible win, zero new lists: one MindMap.xslt (port of the prototype https://claude.ai/artifact/9mD1dH3jVGHWxC4SVuV8zL) + one line in ListsController's view chain (next to kanban/graph). SharePoint has no mind-map surface; the hierarchy is ParentID (its Tasks list), so the map is a VIEW, not a new list kind.