Evergreen campaign mode: automatically top up campaigns with new contacts each month

Right now, keeping an outbound campaign running means manually finding and adding new contacts every month. If you run always-on outreach to a defined target audience, that's a recurring task that pulls you out of your flow.

The request: an "Evergreen" mode for campaigns. Turn it on, define your target audience once, and the campaign automatically pulls in fresh matching contacts on a monthly schedule, skipping anyone you've already reached out to.

This would let teams run a true set-and-forget outbound engine without needing to revisit their campaigns each month just to keep them alive.