Keep follow-up draft generation but remove the direct application SMTP delivery boundary. Route users to the provider-aware Job email flow and return 410 for legacy API callers.
Cross-user access to the new endpoints returns NotFound (carried by the
JobTrackerContext global query filters). Regression guard for the class
of tenant-leak bugs found in the M013-M015 assessments.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>