Queues of whole messages on the wires between nodes (v4/wire.h), the six addresses and ten operations a node asks of the fabric (MESH.md 7d.3), and the fabric's pool of queues. Engine only: the nucleus does not use any of it yet. The ports in the host map move to BUF0_W - 140 so that the new addresses are not among the nucleus variables, with a compile-time check. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>