Mark updated docs pending review for reviewers same day

You update RFC and PRD pages but reviewers miss changes, delaying feedback and engineering decisions. The workflow marks those pages pending review so reviewers can triage updates same day.

Overview

When RFCs and PRDs are updated and reviewers don't see them, engineering decisions stall and planning gets noisy. This flow automatically flags updated documents so program managers and reviewers can triage changes the same day, reducing handoff delays ahead of planning.