New POST /api/v1/integrations/n8n/workflow-error, service-token
authenticated, for the central "Fleet Ops — Workflow Error Handler"
n8n workflow to report a bounded, secret-free failure (workflow id/
name, execution id, safe error category, trigger context, correlation
id, attempt, retry action). Idempotent on execution_id via the same
audit-event precheck pattern used by /return-callback, so a
redelivered error report is not registered twice.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
