Implant apps use hierarchical groups: implant/map, implant/wiki, implant/journal, etc. Apps are mutually exclusive with each other and with gameplay. Opening implant/map hides gameplay + any other implant app. Closing returns to gameplay. API: open_app(), close_app(), toggle_app(), is_app_active(). Star map uses implant/map. Future apps register their own group. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>