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src/layers/README.md

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+# Layers (Dependency Injection)
+
+**Content**: Static Application Wiring.
+
+## Usage
+Construct the final application layers here. This is where you decide:
+"In Production, use Postgres. In Test, use InMemory."
+
+## Example
+
+```typescript
+// Main.layer.ts
+export const MainLayer = Layer.mergeAll(
+  PostgresLive,
+  StripeLive,
+  // ...
+)
+```