fix: enforce atomic agent registration contract

packages/server/package.json

@@ -14,6 +14,7 @@
     "start": "node dist/index.js",
     "start:worker": "node dist/worker.js",
     "start:scheduler": "node dist/scheduler.js",
+    "test": "npm run build && node --test test/*.test.mjs",
     "typecheck": "tsc --noEmit"
   },
   "dependencies": {