Task type: feature planning

Read:
- AGENTS.md
- docs/ai/bevy-quick-reference.md
- docs/ai/bevy-project-patterns.md
- ai/context/project-context.md

Then:
- summarize current architecture
- propose smallest next milestone
- list files to add/edit
- sketch ECS design: components, resources, events, states, plugins
- give ordered patch steps
- give verify commands
- keep Bevy 0.18.1 APIs only