refactor(core): simplify duplicate test layers (#45444)

packages/core/test/lib/effect.ts

@@ -1,6 +1,5 @@
 import { test, type TestOptions } from "bun:test"
-import { Cause, Effect, Exit, Layer } from "effect"
-import type * as Scope from "effect/Scope"
+import { Cause, Effect, Exit, Layer, Scope } from "effect"
 import * as TestClock from "effect/testing/TestClock"
 import * as TestConsole from "effect/testing/TestConsole"
 

packages/core/test/session-instructions.test.ts

@@ -69,7 +69,6 @@ const testLayer = AppNodeBuilder.build(
     ReadToolFileSystem.node,
     readToolNode,
     Tool.node,
-    Tool.node,
     PluginHooks.node,
     SessionInstructions.node,
     Global.node,

packages/core/test/session-runner.test.ts

@@ -449,8 +449,6 @@ const it = testEffect(
       Agent.node,
       Catalog.node,
       Tool.node,
-      Tool.node,
-      PluginHooks.node,
       PluginHooks.node,
       echoNode,
       SessionRunnerModel.node,