Choose product news when creating your account

Send me Elixir product news is checked by default on the sign-in/create-account form. Uncheck it before asking for your email to open a new account without newsletter enrollment. Your code or link keeps that choice, while existing newsletter choices and unsubscribes stay as they are. Sign-in and welcome mail still arrive; reports have their own controls. MCP 11.2.3 and JSON API 3.0.0 unchanged.