Lesson 10 in the flesh: the onApplicationBootstrap fix made the NATS-> WS bridge actually deliver events for the first time, which instantly crashed the API. esModuleInterop is off, so 'import WebSocket from ws' compiles to ws_1.default = undefined; WebSocket.OPEN threw 'Cannot read properties of undefined' and killed the process on the first heartbeat forward. All three WS guard sites (nats-bridge x2, console gateway) switched to the import-agnostic instance constant client.OPEN. Latent in every build — never hit because the bridge was dead-on-boot until today. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>