fix(cli): exit non-zero when inspect or watch fails - #591

Internal server error. Correlation ID: ce088f7b-6921-4912-b6cc-fc54ae6e3a53

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/