feat(hierarchy): M4-1b-ii hierarchy command family, grant evaluation, visibility (#1465)

apps/gateway/src/commands/command-authorization.service.ts

@@ -154,8 +154,15 @@ export class CommandAuthorizationService {
     return role === 'admin' || role === 'member' || role === 'viewer' ? role : null;
   }
 
+  /**
+   * Contract 2 §1.1: platform admin confers instance administration only —
+   * the former admin-passes-every-scope short-circuit is retired. Admin
+   * reaches exactly the admin scope; core/agent scopes belong to the member
+   * role; skill/plugin scopes stay deny-for-all until a grant mapping names
+   * them (§3.1 deny-by-default).
+   */
   private hasScope(role: CommandRole, scope: CommandDef['scope']): boolean {
-    if (role === 'admin') return true;
+    if (scope === 'admin') return role === 'admin';
     return role === 'member' && (scope === 'core' || scope === 'agent');
   }