The distributed inference, topology and device-capability code derives
from exo (github.com/exo-explore/exo), which was GPL-3.0 when this fork
was taken. The package declared BSD-3-Clause, which grants terms the
upstream licence does not.
Ship exo's GPL-3.0 text, add a NOTICE naming upstream and recording the
modifications, and declare GPL-3.0-only. hanzo-network stays an optional
extra with guarded imports, so the base CLI is unaffected.
