docs: Document the boxes

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>

docs/boxes/colony/qclk.md

@@ -0,0 +1,22 @@
+# qclk
+
+The `qclk` service container.
+
+- **Source:** [`shill/containers/qclk/`](../../../nixos/boxes/colony/vms/shill/containers/qclk)
+- **Host:** NixOS container on `shill`
+
+## Role
+
+- Runs the custom `qclk` service, exposing an API that is reached over a
+  dedicated WireGuard **`management`** network. Managed devices are configured as
+  WireGuard peers (each gets an address in the `qclk` prefix), and AS211024
+  trusted hosts are allowed to reach the API.
+- `shill` routes the `qclk` prefix to this container.
+
+## Networking
+
+- `internal` assignment on the `ctrs` network (alt name `qclk-ctr`), plus the
+  `management` WireGuard interface carrying the `qclk` prefix.
+
+> Check `qclk/default.nix` for the current peer list and exactly what the service
+> does — this entry intentionally stays high-level.