34 shipped network blueprints

Shipped 34 first-class network blueprints under `configs/networks/`. Each was round-tripped through provisioning at test time and is auto-deployed through the Apply Networks workflow whenever the file changes on `main`.

This is the first cut of "first-class networks" — opinionated policy defaults baked into the binary so a fresh deployment can join a real network without authoring blueprints from scratch. Includes the data-exchange policy tightening that landed in the same commit group.

Peers without a specific custom-network requirement can join from this shipped roster directly. The 30 open-data networks (entry dated 2026-04-26) sit on top of these.