feat(docs): grant handbook access to authenticated users

tests/test_docs_context.py

@@ -33,6 +33,18 @@ class FakePrincipal:
 
 
 class DocsContextTests(unittest.TestCase):
+    def test_docs_reader_is_the_managed_authenticated_tenant_default(self) -> None:
+        manifest = get_docs_manifest()
+        roles = {template.slug: template for template in manifest.role_templates}
+
+        self.assertTrue(roles["docs_reader"].default_authenticated)
+        self.assertTrue(roles["docs_reader"].managed)
+        self.assertEqual(roles["docs_reader"].level, "tenant")
+        self.assertEqual(
+            roles["docs_reader"].permissions,
+            ("docs:documentation:read",),
+        )
+
     def test_topic_groups_preserve_layer_classification(self) -> None:
         registry = PlatformRegistry()
         registry.register(get_tenancy_manifest())