test: reduce default runner noise and contention

packages/engine/package.json

@@ -18,7 +18,7 @@
   "scripts": {
     "build": "tsc",
     "typecheck": "tsc --noEmit",
-    "test": "vitest run",
+    "test": "vitest run --silent=passed-only --reporter=dot",
     "test:executor": "vitest run src/executor.test.ts",
     "test:watch": "vitest src/executor.test.ts --watch"
   },

packages/engine/vitest.config.ts

@@ -2,7 +2,7 @@ import { defineConfig } from "vitest/config";
 import { availableParallelism } from "node:os";
 import { resolve } from "node:path";
 
-const defaultMaxWorkers = Math.max(1, Math.min(4, Math.ceil(availableParallelism() / 8)));
+const defaultMaxWorkers = Math.max(1, Math.min(2, Math.ceil(availableParallelism() / 8)));
 const maxWorkers = Number.parseInt(process.env.VITEST_MAX_WORKERS ?? String(defaultMaxWorkers), 10);
 
 export default defineConfig({