Circuit discovered_write_hub_edges (GPT-2)

DISCOVERED (novel-live composition edges) — scope: gpt2

DISCOVERED (not pre-named): novel composition edges that survived the path-patch liveness gate vs a reader-matched null — the collection-goal output.

• 22 novel-live edges (of 22 new); 13 named by behaviour: {‘prevtok’: 9, ‘sink’: 3, ‘duplicate’: 1}
• edges: 0.9->2.9, 0.9->2.5, 1.8->10.9, 1.8->9.3, 0.9->1.3, 1.8->3.2, 1.10->2.11, 1.8->10.5, 0.11->2.9, 0.11->2.5
• These are mostly early sink/write-hub → prev-token-key broadcasters (the absolute-position plumbing).

Data: runs/disassembly/circuits/atlas_summary.json + the discovery artifacts. Regenerate: circuit_catalog_doc.py.