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diff --git a/engine/traits/core-beliefs.ts b/engine/traits/core-beliefs.ts
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+/**
+ * Core beliefs shape how adult events are interpreted (docs/04-traits.md
+ * §"Layer 2"). Each 0–100. Formed in early childhood, harder to shift after.
+ */
+export interface CoreBeliefs {
+  readonly selfWorth: number
+  readonly worldSafety: number
+  readonly othersTrustworthy: number
+  readonly agency: number
+}