fix(test): use instance helper in native fallback test

packages/opencode/test/session/llm.test.ts

@@ -5,7 +5,6 @@ import { Cause, Effect, Exit, Stream } from "effect"
 import z from "zod"
 import { makeRuntime } from "../../src/effect/run-service"
 import { LLM } from "../../src/session/llm"
-import { Instance } from "../../src/project/instance"
 import { WithInstance } from "../../src/project/with-instance"
 import { Provider } from "@/provider/provider"
 import { ProviderTransform } from "@/provider/transform"
@@ -979,7 +978,7 @@ describe("session.llm.stream", () => {
         },
       })
 
-      await Instance.provide({
+      await WithInstance.provide({
         directory: tmp.path,
         fn: async () => {
           const resolved = await getModel(ProviderID.make("anthropic"), ModelID.make(model.id))