The diagnostic track explains the mechanism. The documentary track proves it happened before. They didn't need to be written together. Stream width is paper count. Hover to inspect.
The Convergence is the pivot of the entire program. It is where the diagnostic argument meets the documentary record — where the mechanism named in Sagas I–III is shown to be the same mechanism operating in Sagas VI–XI. The Lineage Question that follows asks the only question the convergence leaves open: not what is happening, and not whether it has happened before, but why it matters at the level beneath the pragmatic. What is at stake in a species that can build systems capable of degrading the cognition that built them?
The asymmetry in the stream widths is not incidental. The diagnostic track is thin — 14 papers that establish the mechanism in precise argument. The documentary track is wide — 125 papers that prove it happened in the real world with real institutions making real decisions. The thinness of the diagnostic track reflects a design choice: the argument is compressed so that the evidence can do its work. If you have read the diagnostic track, the documentary track is not a surprise. It is confirmation at scale.