Temporal Community Flow (deferred)

Note: this view is removed from the nav pending a rebuild. Each band is one Leiden community sliced by decade — communities are detected once across the full citation/semantic graph, so by construction every flow is community C in decade D → community C in decade D+1. Both ends carry the same label and there are no cross-community transitions. See V7 Streams for the same size-over-time signal in a clearer stacked form.