The $5B+ cross-agency AI overlay (DOE-led; spans NSF/NIH/DoD/NASA — $583M+ in named NSF lines alone) — modeled as a thread crossing the gov-pool nodes, not a node itself. Fresh (07-22) and NO primary source yet: first job is pinning the actual program document. Track: the authorizing instrument, per-agency allocations, and whether it becomes the umbrella for nuclear-for-AI money.