Map every running service to NS1 host names.

Document machine DNS (NS1.GEORGELAMBERT.ORG) and suggested
*.zapier.georgelambert.org names for public doors versus loopback workers.

scripts/build-docs-site.py

@@ -43,6 +43,7 @@ SECTIONS = [
             ("packages/overview/06-address-routing.md", "Address routing"),
             ("packages/overview/08-diagrams.md", "Architectural diagrams"),
             ("packages/overview/10-docs-sync.md", "Docs sync: portal, IAM, keep, bootstrap"),
+            ("packages/overview/11-hostnames.md", "Service → machine and DNS host names"),
         ],
     ),
     (