Records that compudynamics is the kernel's Stadium (words, VMs, blocks, messages and ACLs all patrons of one engine), v3's block subsystem as built, and the ruling of 2026-10-05: a v4 node only asks for a block by number; ownership, ACL, physics and devices stay on the kernel's side under the VM's identity. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>