nx_hub_roles_seed.nx

nx_hub_roles_seed.nx -- seed the HUB ROLES registry (handle -> access level) into the SOVEREIGN content-addressed store via nx_native_config (ncfg_*), NOT roles.tsv (operator: no tsv; use the nishi ecosystem data management). Row = {handle, level}; nx_hub_gw resolves a session's level from here (hgw_level_native) for the leveled hub index -- replacing the roles.tsv read. level vocab matches nx_maturity_registry mr_level_of: 0=public/anon 1=viewer/family 2=member 3=operator/owner. Additive: add family/member handles with more rows the same way (content-addressed, history-preserving).