refactor: clarify simulation ownership

docs/README.md

@@ -6,22 +6,24 @@ sources of truth.
 1. [`PROJECT_CONTEXT.md`](PROJECT_CONTEXT.md) is the canonical description of
    the vision, current implementation, target architecture, and active
    constraints.
-2. [`LEARNING_ROADMAP.md`](LEARNING_ROADMAP.md) owns milestone order,
+2. [`ARCHITECTURE_OVERVIEW.md`](ARCHITECTURE_OVERVIEW.md) is the concise map of
+   runtime ownership, folder responsibilities, and dependency rules.
+3. [`LEARNING_ROADMAP.md`](LEARNING_ROADMAP.md) owns milestone order,
    architecture gates, reusable-system exit tests, and intentionally deferred
    work.
-3. [`BUILD_IN_PUBLIC_PLAN.md`](BUILD_IN_PUBLIC_PLAN.md) owns the scoped Jajce
+4. [`BUILD_IN_PUBLIC_PLAN.md`](BUILD_IN_PUBLIC_PLAN.md) owns the scoped Jajce
    visual slice. It must respect the architecture gates in the learning
    roadmap.
-4. [`RESOURCE_NODE_MIGRATION.md`](RESOURCE_NODE_MIGRATION.md) is a focused
+5. [`RESOURCE_NODE_MIGRATION.md`](RESOURCE_NODE_MIGRATION.md) is a focused
    migration plan. Phases 1–6 are complete; follow-up work should expand
    resource discovery without reintroducing abstract resource zones.
-5. [`ACTION_SYSTEM_ARCHITECTURE.md`](ACTION_SYSTEM_ARCHITECTURE.md),
+6. [`ACTION_SYSTEM_ARCHITECTURE.md`](ACTION_SYSTEM_ARCHITECTURE.md),
    [`ECONOMIC_EVENTS.md`](ECONOMIC_EVENTS.md),
    [`FOOD_STORAGE_ARCHITECTURE.md`](FOOD_STORAGE_ARCHITECTURE.md),
    [`SIMULATION_DEFINITIONS.md`](SIMULATION_DEFINITIONS.md), and
    [`SIMULATION_STATE_SCHEMA.md`](SIMULATION_STATE_SCHEMA.md) document the
    current data contracts.
-6. [`decisions/`](decisions/) contains durable architectural decisions,
+7. [`decisions/`](decisions/) contains durable architectural decisions,
    including consequences and revisit conditions.
 
 When documents disagree: