fix(test): isolate shared vitest home setup

test/setup.shared.ts

@@ -51,13 +51,41 @@ type SharedTestSetupOptions = {
   loadProfileEnv?: boolean;
 };
 
+const SHARED_TEST_SETUP = Symbol.for("openclaw.sharedTestSetup");
+
+type SharedTestSetupHandle = {
+  cleanup: () => void;
+  tempHome: string;
+};
+
 export function installSharedTestSetup(options?: SharedTestSetupOptions): {
   cleanup: () => void;
   tempHome: string;
 } {
+  const globalState = globalThis as typeof globalThis & {
+    [SHARED_TEST_SETUP]?: SharedTestSetupHandle;
+  };
+  const existing = globalState[SHARED_TEST_SETUP];
+  if (existing) {
+    return existing;
+  }
+
   const testEnv = withIsolatedTestHome({
     loadProfileEnv: options?.loadProfileEnv,
   });
   installProcessWarningFilter();
-  return testEnv;
+
+  let cleaned = false;
+  const handle: SharedTestSetupHandle = {
+    tempHome: testEnv.tempHome,
+    cleanup: () => {
+      if (cleaned) {
+        return;
+      }
+      cleaned = true;
+      testEnv.cleanup();
+    },
+  };
+  globalState[SHARED_TEST_SETUP] = handle;
+  return handle;
 }