Refine memory system user-key flow and search output

tests/test_memory_system_server.py

@@ -2,6 +2,15 @@ def test_memory_system_server_exposes_routes():
     from memory_system_api.server import app
 
     paths = {route.path for route in app.routes}
+    assert "/memory-system/users" in paths
     assert "/memory-system/messages" in paths
     assert "/memory-system/search" in paths
     assert "/memory-system/users/{user_id}/profile" in paths
+
+
+def test_memory_system_messages_does_not_require_account_key_header():
+    from memory_system_api.server import app
+
+    route = next(route for route in app.routes if getattr(route, "path", "") == "/memory-system/messages")
+
+    assert all(getattr(dependency.call, "__name__", "") != "account_key_header" for dependency in route.dependant.dependencies)