chore: tune vitest parallelism

vitest.live.config.ts

@@ -2,6 +2,8 @@ import { defineConfig } from "vitest/config";
 
 export default defineConfig({
   test: {
+    pool: "forks",
+    maxWorkers: 1,
     include: ["src/**/*.live.test.ts"],
     setupFiles: ["test/setup.ts"],
     exclude: [