Add back @public

packages/celest/lib/src/grants/grants.dart

@@ -14,6 +14,23 @@ import 'package:celest/src/core/entity.dart';
 /// ```
 const authenticated = _Authenticated();
 
+/// A grant which provides access to everyone.
+///
+/// **NOTE**: Using this grant on a function or library will make it accessible
+/// to the public internet. Anyone will be able to call the functions.
+///
+/// ## Example
+///
+/// ```dart
+/// import 'package:celest/celest.dart';
+///
+/// @public
+/// Future<void> sayHello() async {
+///   print('Hello, stranger!');
+/// }
+/// ```
+const public = _Public();
+
 final class _Role implements Entity {
   const _Role({
     required this.name,
@@ -38,3 +55,7 @@ final class _Grant {
 final class _Authenticated extends _Grant {
   const _Authenticated() : super(to: const [_Role.authenticated]);
 }
+
+final class _Public {
+  const _Public();
+}