onVercelDeploymentFailed emits failed Vercel deployments without requiring a check for the provider’s deployment.error discriminator.
automations/watch-failed-vercel-deployments.automation.ts
account defaults to the project’s Vercel OAuth binding.
Trigger data
Returns the deployment event shape, narrowed totype: "deployment.error". Vercel calls failed deployment webhooks deployment.error; the Automate.ax callable uses the clearer “failed” name.