Replace Instance.disposeAll/load with fixture helper (#25418)

packages/opencode/test/snapshot/snapshot.test.ts

@@ -6,7 +6,7 @@ import { Effect } from "effect"
 import { Snapshot } from "../../src/snapshot"
 import { Instance } from "../../src/project/instance"
 import { Filesystem } from "@/util/filesystem"
-import { provideInstance, tmpdir } from "../fixture/fixture"
+import { disposeAllInstances, provideInstance, tmpdir } from "../fixture/fixture"
 
 // Git always outputs /-separated paths internally. Snapshot.patch() joins them
 // with path.join (which produces \ on Windows) then normalizes back to /.
@@ -14,7 +14,7 @@ import { provideInstance, tmpdir } from "../fixture/fixture"
 const fwd = (...parts: string[]) => path.join(...parts).replaceAll("\\", "/")
 
 afterEach(async () => {
-  await Instance.disposeAll()
+  await disposeAllInstances()
 })
 
 async function bootstrap() {