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

packages/opencode/test/mcp/oauth-auto-connect.test.ts

@@ -116,7 +116,7 @@ const { EventV2Bridge } = await import("../../src/event-v2-bridge")
 const { Config } = await import("../../src/config/config")
 const { McpAuth } = await import("../../src/mcp/auth")
 const { McpOAuthProvider } = await import("../../src/mcp/oauth-provider")
-const { AppFileSystem } = await import("@opencode-ai/core/filesystem")
+const { FSUtil } = await import("@opencode-ai/core/fs-util")
 const { CrossSpawnSpawner } = await import("@opencode-ai/core/cross-spawn-spawner")
 
 const mcpTest = testEffect(
@@ -126,7 +126,7 @@ const mcpTest = testEffect(
       Layer.provideMerge(EventV2Bridge.defaultLayer),
       Layer.provide(Config.defaultLayer),
       Layer.provide(CrossSpawnSpawner.defaultLayer),
-      Layer.provide(AppFileSystem.defaultLayer),
+      Layer.provide(FSUtil.defaultLayer),
     ),
     McpAuth.defaultLayer,
   ),