Name the site domains the identifiers are stems of

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

docs/Architecture-Build-Spec.md

@@ -35,10 +35,11 @@ same string across all of those: the VM, the container, the Caddy host, the Matr
 account, and the Bitwarden machine account for a given agent all share one name, so
 that grepping the infrastructure for `nisse-ops` finds everything.
 
-**Sites** are identified by their domain stem: `garrett-hall` (Arlington) and
-`hartman-hut` (Cross Plains). As with agent names, one string is used everywhere a site
-appears. For an MCP server instance (F3), that means its container name, its
-Vaultwarden machine account, and its MCP tool prefix.
+**Sites** are identified by their domain stem: `garrett-hall` (Arlington, hosts under
+`garrett-hall.com`) and `hartman-hut` (Cross Plains, hosts under `hartman-hut.com`).
+As with agent names, one string is used everywhere a site appears. For an MCP server
+instance (F3), that means its container name, its Vaultwarden machine account, and
+its MCP tool prefix.
 
 The three artifacts live as three packages in **one repository, `nisse`** (decision
 recorded in Part H). Directory and package names carry the identity. If mirrored to