refactor(opencode): remove core service layer exports (#34518)

packages/opencode/src/event-v2-bridge.ts

@@ -11,7 +11,7 @@ import { Context, Effect, Layer } from "effect"
 
 export class Service extends Context.Service<Service, EventV2.Interface>()("@opencode/EventV2Bridge") {}
 
-export const layer = Layer.effect(
+const layer = Layer.effect(
   Service,
   Effect.gen(function* () {
     const events = yield* EventV2.Service
@@ -66,8 +66,6 @@ export const layer = Layer.effect(
   }),
 )
 
-export const defaultLayer = layer.pipe(Layer.provide(EventV2.defaultLayer))
-
 export const node = LayerNode.make({ service: Service, layer: layer, deps: [EventV2.node] })
 
 export * as EventV2Bridge from "./event-v2-bridge"