ADR 0110: admit the-private-network, claimed by a manifest the control plane composes in code

The enumeration behind the first set read manifests in two repositories and missed a claim made
in the control plane's own code: the private-network module it ships claims the-private-network at
node scope. A closed set without it would refuse the control plane's own module. Thirteen claims in
use, naming twelve seats.

03-DESIGN/01-to-be/26-the-seats.md

@@ -56,6 +56,7 @@ argued for is an entry nobody can explain.
 | `the-dns-port` | node | — | the local resolver |
 | `the-intrusion-prevention` | node | — | an intrusion-prevention service |
 | `the-packet-filter` | node | — | the packet filter |
+| `the-private-network` | node | — | the private network the mesh runs over |
 | `the-resolver-configuration` | node | — | whichever of the alternative resolver configurations is chosen |
 | `the-showcase` | node | — | the showcase module |