The real defect is same-node consumers announced the declared port instead of
the assigned/published one; the loopback observation was a stale pre-0038 build.
Fixed in mesh-control fix/same-node-provider-announced-port (c147a26) with a
regression test.
Claude-Session: https://claude.ai/code/session_01LrgweAeERJYBg88c5cKDzF