refactor(instance): remove legacy runtime fallback (#27757)

packages/opencode/test/question/question.test.ts

@@ -1,7 +1,7 @@
 import { afterEach, expect } from "bun:test"
 import { Cause, Effect, Exit, Fiber, Layer, Queue } from "effect"
 import { Question } from "../../src/question"
-import { Instance } from "../../src/project/instance"
+import { InstanceRef } from "../../src/effect/instance-ref"
 import { InstanceRuntime } from "../../src/project/instance-runtime"
 import { QuestionID } from "../../src/question/schema"
 import { disposeAllInstances, provideInstance, reloadTestInstance, tmpdirScoped } from "../fixture/fixture"
@@ -404,7 +404,10 @@ it.live("pending question rejects on instance dispose", () =>
     }).pipe(provideInstance(dir), Effect.forkScoped)
 
     expect(yield* waitForPending(1).pipe(provideInstance(dir))).toHaveLength(1)
-    const ctx = yield* Effect.sync(() => Instance.current).pipe(provideInstance(dir))
+    const ctx = yield* Effect.gen(function* () {
+      return yield* InstanceRef
+    }).pipe(provideInstance(dir))
+    if (!ctx) return yield* Effect.die(new Error("missing test instance"))
     yield* Effect.promise(() => InstanceRuntime.disposeInstance(ctx))
 
     const exit = yield* Fiber.await(fiber)