fix: throttle vitest under local contention

scripts/run-vitest.mjs

@@ -0,0 +1,26 @@
+import { spawnPnpmRunner } from "./pnpm-runner.mjs";
+
+const forwardedArgs = process.argv.slice(2);
+
+if (forwardedArgs.length === 0) {
+  console.error("usage: node scripts/run-vitest.mjs <vitest args...>");
+  process.exit(1);
+}
+
+const child = spawnPnpmRunner({
+  pnpmArgs: ["exec", "vitest", ...forwardedArgs],
+  env: process.env,
+});
+
+child.on("exit", (code, signal) => {
+  if (signal) {
+    process.kill(process.pid, signal);
+    return;
+  }
+  process.exit(code ?? 1);
+});
+
+child.on("error", (error) => {
+  console.error(error);
+  process.exit(1);
+});