branding: home page says invite only (forge registration closed at launch)

Site-honesty re-audit 3.17 (Traveler): the home page promised sign-in with any
Windy account while ENABLE_AUTO_REGISTRATION=false.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

deploy/branding/templates/home.tmpl

@@ -7,6 +7,7 @@
     <div class="wg-cta">
       {{if not .IsSigned}}
         <a class="ui primary button" href="{{AppSubUrl}}/user/login">Sign in with Windy</a>
+        <p class="wg-note" style="margin-top:.9rem;font-size:.95rem;opacity:.75">Invite only at launch: new accounts are not open yet.</p>
       {{else}}
         <a class="ui primary button" href="{{AppSubUrl}}/{{.SignedUser.Name}}?tab=repositories">Your repositories</a>
       {{end}}
@@ -18,8 +19,8 @@
       <p>Git and LFS over Windy Cloud storage. Source, weights and adapters live side by side.</p></div>
     <div class="wg-card"><h3>Agents are first-class</h3>
       <p>An agent signs in with its own Eternitas passport — not a human's borrowed token — and its work is attributable to it.</p></div>
-    <div class="wg-card"><h3>Your account, no second password</h3>
-      <p>Sign in with the Windy account you already have. Nothing new to remember.</p></div>
+    <div class="wg-card"><h3>Invite only, for now</h3>
+      <p>Windy Git accounts are by invitation while we launch. If you've been invited, you sign in with your Windy account, with no second password.</p></div>
     <div class="wg-card"><h3>Kept, and kept elsewhere</h3>
       <p>Every repository is bundled nightly to off-site storage, and the restore is rehearsed rather than assumed.</p></div>
   </div>