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

packages/opencode/test/fixture/db.ts

@@ -1,9 +1,9 @@
 import { rm } from "fs/promises"
-import { Instance } from "../../src/project/instance"
 import { Database } from "@/storage/db"
+import { disposeAllInstances } from "./fixture"
 
 export async function resetDatabase() {
-  await Instance.disposeAll().catch(() => undefined)
+  await disposeAllInstances().catch(() => undefined)
   Database.close()
   await rm(Database.Path, { force: true }).catch(() => undefined)
   await rm(`${Database.Path}-wal`, { force: true }).catch(() => undefined)

packages/opencode/test/fixture/fixture.ts

@@ -9,8 +9,16 @@ import { ChildProcess, ChildProcessSpawner } from "effect/unstable/process"
 import type { Config } from "@/config/config"
 import { InstanceRef } from "../../src/effect/instance-ref"
 import { Instance } from "../../src/project/instance"
+import { InstanceStore } from "../../src/project/instance-store"
 import { TestLLMServer } from "../lib/llm-server"
 
+// Test helper for tearing down all loaded instances. Used in afterEach hooks.
+// Replaces direct Instance.disposeAll() calls so the legacy promise method can be removed.
+// IMPORTANT: must use InstanceStore.runtime, not AppRuntime or a test-layer Service —
+// Instance.provide loads instances into InstanceStore.runtime's Service cache, and that
+// Service is built per-runtime (not shared via memoMap across Effect.runPromise boundaries).
+export const disposeAllInstances = () => InstanceStore.runtime.runPromise((s) => s.disposeAll())
+
 // Strip null bytes from paths (defensive fix for CI environment issues)
 function sanitizePath(p: string): string {
   return p.replace(/\0/g, "")