Route auth publish URLs through facade

user-auth.mjs

@@ -25,10 +25,10 @@ import {
   resolvePolicies,
 } from './policies.mjs';
 import {
+  buildPublicUrl,
   ensurePublishSkillInstalled,
   ensureUserPublishLayout,
   ensureWorkspaceHintsInstalled,
-  PUBLISH_ROOT_DIR,
   PUBLISH_SKILL_NAME,
   resolvePublicBaseUrl,
   resolveLegacyPublishDir,
@@ -228,7 +228,7 @@ export function createUserAuth(pool, options = {}) {
     return {
       ...base,
       publishSlug: publishKey,
-      publishUrl: `${publicBaseUrl}/${PUBLISH_ROOT_DIR}/${encodeURIComponent(publishKey)}/`,
+      publishUrl: buildPublicUrl(publicBaseUrl, publishKey),
       publishSkillName: PUBLISH_SKILL_NAME,
     };
   };