v1.25.3 - Accurate pack login state

Stops the false "session may have expired" warning on enigma <pack>.

A Claude access token that is past its expiry but still has a refresh token is fine - the agent refreshes it automatically. enigma now treats that as a valid login and only warns when an account is genuinely signed out (no token) or unrefreshable (past expiry with no refresh token). The launch warning also points you at a specific signed-in account to seed from.

Ships enigma-cli@1.25.3.