init repo

ai/prompts/plan.md

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+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