A planetary gear assembly modeled as a CSG graph: r(structural ↔ CSG-operations) = 0.668, p = 0.042, Δr = 0.935. Pre-registered before running. Computational geometry via continuous CSG operations is now a confirmed domain. BC3b boundary defined.
cobra (the Go CLI framework behind kubectl, Hugo, and dozens of major projects) produces r = −0.862 (p = 0.014). The declared hub is the least behaviorally active node. This is BC_INVERSION: fan-out with leaf clustering — and it is structurally distinct from BC_RADIAL.
docopt in Go, Java, and Rust all denied the Functional Proximity Law via the same mechanism. When a single hub fans out to all leaves, the behavioral layer's hub-rank vector approaches a constant — and Pearson r collapses toward zero. Named mechanism: BC_RADIAL.
F6 pre-registered result: Transformer is the top hub by citation lineage and architectural inheritance, but LLaMA leads current benchmarks. Two layers, same 20 models — structurally divergent hubs reveal the gap between historical influence and contemporary relevance.
Godot scores r = 0.925. PostgreSQL scores r = -0.120. Both are large, mature, well-maintained open-source codebases. The difference is not code quality — it is governance and commit discipline.
We ran the structural hub analyzer on 18 major GitHub repositories and stored every result publicly. 10 of 18 confirmed the IRDME structural law (r >= 0.3). The pattern splits cleanly by software category.