refactor(core): finish test layer node conversion (#34385)

packages/core/test/system-context/registry.test.ts

@@ -1,5 +1,6 @@
 import { describe, expect } from "bun:test"
 import { Cause, Effect, Exit, Schema, Scope } from "effect"
+import { AppNodeBuilder } from "@opencode-ai/core/effect/app-node-builder"
 import { SystemContext } from "@opencode-ai/core/system-context"
 import { SystemContextRegistry } from "@opencode-ai/core/system-context/registry"
 import { testEffect } from "../lib/effect"
@@ -17,7 +18,7 @@ const entry = (key: string, text: string, sourceKey = key) => ({
   ),
 })
 
-const it = testEffect(SystemContextRegistry.layer)
+const it = testEffect(AppNodeBuilder.build(SystemContextRegistry.node))
 
 describe("SystemContextRegistry", () => {
   it.effect("loads empty system context when there are no entries", () =>