refactor(core): consolidate filesystem services (#30447)

packages/core/test/config/config.test.ts

@@ -4,7 +4,7 @@ import { describe, expect } from "bun:test"
 import { Effect, Layer } from "effect"
 import { Config } from "@opencode-ai/core/config"
 import { ConfigProvider } from "@opencode-ai/core/config/provider"
-import { AppFileSystem } from "@opencode-ai/core/filesystem"
+import { FSUtil } from "@opencode-ai/core/fs-util"
 import { Global } from "@opencode-ai/core/global"
 import { Location } from "@opencode-ai/core/location"
 import { Policy } from "@opencode-ai/core/policy"
@@ -23,7 +23,7 @@ function testLayer(
   vcs?: Project.Vcs,
 ) {
   return Config.locationLayer.pipe(
-    Layer.provide(AppFileSystem.defaultLayer),
+    Layer.provide(FSUtil.defaultLayer),
     Layer.provide(Global.layerWith({ config: globalDirectory })),
     Layer.provide(
       Layer.succeed(