No definition names this installation

keycloak, minio and n8n are told their names from their route bindings; mailu takes its domain, site
name, website and proxy address as settings and its front's name from its route, and the provisioner
reads the domain from the merged config; builder and route-proxy package the controller from the git
seat; the applications built outside the mesh say so per container; matrix says which of the world's
servers it means; the site module is named website, and the why prose no longer names a name (novox/hq
ADR 0155, issues 122 and 134). module check passes over all 77.

modules/mailu/provisioner/index.ts

@@ -13,17 +13,32 @@
 // it to both ends; mailu sets exactly that password every run — so a rotation takes — and seals
 // nothing: the consumer already has its copy through the mesh's own channel.
 
+import { readFileSync } from "node:fs";
 import { runProvisioner, type Provision } from "@novox/mesh-sdk/provisioner";
 import { MailuClient } from "../client.js";
 
 const mailu = MailuClient.fromEnv();
 
-// The mail server's own domain. From the environment the manifest composes, because the client's
-// config file carries the admin API's coordinates, not the mail domain.
+// The mail server's own domain: the operator's value, from the settings the mesh merges into this
+// module's config file (`settings set mailu` with {"domain": …}; novox/hq ADR 0112, ADR 0155). A
+// definition names no mesh, so it is never a literal in the manifest — and it used to be, as
+// MESH_MAILU_DOMAIN, which is still read for a mesh that has not re-registered the manifest.
 function domain(): string {
+  const file = process.env.MESH_MAILU_CONFIG_FILE;
+  if (file) {
+    try {
+      const config = JSON.parse(readFileSync(file, "utf8")) as { domain?: unknown };
+      if (typeof config.domain === "string" && config.domain.trim() !== "") return config.domain.trim();
+    } catch {
+      // Unreadable or not JSON: fall through to the environment, and the error below names both.
+    }
+  }
   const named = (process.env.MESH_MAILU_DOMAIN ?? "").trim();
   if (named === "") {
-    throw new Error("MESH_MAILU_DOMAIN is not set, so a consumer's address cannot be composed");
+    throw new Error(
+      "no mail domain is set, so a consumer's address cannot be composed — `settings set mailu <file>` " +
+        'with {"domain": "<the mail domain>"}',
+    );
   }
   return named;
 }