The diff view

The third view mode, next to Standard and Edit: pick any two versions and the canvas renders both at once as a git-style overlay — green added, red removed (ghosted, dashed), amber changed, unchanged dimmed. It reads straight from history, so “what did the assistant actually do last week?” is two clicks.

Only meaning counts: renames, re-wires, added and removed things. Positions and edge routing are layout and never show as changes. The diff is a view like any other — copy the link and send it.