test(FN-000): harden local test suite

packages/pi-llama-cpp/vitest.config.ts

@@ -1,7 +1,17 @@
 import { defineConfig } from "vitest/config";
+import { resolve } from "node:path";
+import { computeMaxWorkers } from "../core/src/__test-utils__/vitest-workers";
+
+const maxWorkers = computeMaxWorkers();
 
 export default defineConfig({
   test: {
     globals: true,
+    setupFiles: [resolve(__dirname, "../core/src/__test-utils__/vitest-setup.ts")],
+    globalSetup: [resolve(__dirname, "../core/src/__test-utils__/vitest-teardown.ts")],
+    pool: "forks",
+    maxWorkers,
+    poolOptions: { forks: { minForks: 1, maxForks: maxWorkers } },
+    fileParallelism: true,
   },
 });