With go-package-registry bound, the fetch's GOPROXY is the Go seat, then proxy.golang.org, then direct (kept for
this milestone, E11: removed by the first change after mesh-sdk's and mesh-contracts' first numbered versions
are in the Go seat); no GOPRIVATE, and the checksum database off for the forge's paths (design 51 *Go packages*,
ADR 0605 §6). The module requires and binds go-package-registry, so its new build waits for the forge's build
that offers it (E2). Unbound, the fetch is as before.
Claude-Session: https://claude.ai/code/session_01JG73KJNrH5EgFXMKKYSrig