Send notice email when contact details are invalid

You flag deals with incorrect contact details and emails go unsent, leaving reps blind to reachability gaps. It queues a tailored notice email so reps can recover outreach the same day.

Overview

When deals move to an invalid-contact status, outreach can stall and pipeline momentum drops. This flow queues a templated notice email into reps' outboxes so they can recover unreachable leads and act on them the same day.