Add a top-level `README.md` mapping the boxes and per-machine docs under
`docs/boxes/` (grouped `colony/`, `home/`, `misc/`), one file per host, VM and
container documenting role, services and networking with source pointers.
Also point `AGENTS.md` at the new docs.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
