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

packages/opencode/test/cli/effect-cmd-instance-als.test.ts

@@ -1,12 +1,12 @@
 import { afterEach, expect } from "bun:test"
-import { AppFileSystem } from "@opencode-ai/core/filesystem"
+import { FSUtil } from "@opencode-ai/core/fs-util"
 import { Effect } from "effect"
 import { fileURLToPath } from "url"
 import { InstanceRef } from "../../src/effect/instance-ref"
 import { disposeAllInstances, TestInstance } from "../fixture/fixture"
 import { testEffect } from "../lib/effect"
 
-const it = testEffect(AppFileSystem.defaultLayer)
+const it = testEffect(FSUtil.defaultLayer)
 
 afterEach(async () => {
   await disposeAllInstances()
@@ -14,7 +14,7 @@ afterEach(async () => {
 
 it.live("effect-cmd.ts does not restore legacy instance ALS", () =>
   Effect.gen(function* () {
-    const fs = yield* AppFileSystem.Service
+    const fs = yield* FSUtil.Service
     const source = yield* fs.readFileString(fileURLToPath(new URL("../../src/cli/effect-cmd.ts", import.meta.url)))
     expect(source).not.toContain("restore(ctx")
   }),