strip session-added comments

crates/application/tests/auth/register_test.rs

@@ -90,7 +90,6 @@ async fn registration_refuses_a_retired_username() {
         .unwrap()
         .unwrap();
     users.mark_deleted(old.id(), &[]).await.unwrap();
-    // The purge removes the row; only the retired name keeps the username taken.
     users.delete_user(old.id());
 
     let err = register::execute(&deps, register_command("new@example.com", "Ghost"))