Stable id of the network owned by the node at this path, derived purely from the (structural) path and peer so it reproduces across `to_runtime` -> `from_runtime` round trips rather than depending on traversal order. A domain tag keeps it from colliding with this node's own `to_global_id`. The root network is `ROOT_NETWORK` and never goes through here.
(&self, peer: PeerId)
source not stored for this graph (policy: none)
no test coverage detected