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

packages/opencode/test/server/httpapi-raw-route-auth.test.ts

@@ -8,7 +8,7 @@ import { PtyPaths } from "../../src/server/routes/instance/httpapi/groups/pty"
 import { ExperimentalHttpApiServer } from "../../src/server/routes/instance/httpapi/server"
 import { PtyID } from "../../src/pty/schema"
 import { resetDatabase } from "../fixture/db"
-import { tmpdir } from "../fixture/fixture"
+import { disposeAllInstances, tmpdir } from "../fixture/fixture"
 import * as Log from "@opencode-ai/core/util/log"
 
 void Log.init({ print: false })
@@ -49,7 +49,7 @@ async function cancelBody(response: Response) {
 
 afterEach(async () => {
   Flag.OPENCODE_EXPERIMENTAL_HTTPAPI = originalHttpApi
-  await Instance.disposeAll()
+  await disposeAllInstances()
   await resetDatabase()
 })