Handler was inside 'if (sender == this)' but MAIL_LOAD_AUTO_MISSION is sent
from ConLobby (sender != this), so it never fired. All game params (FriendlyFire,
SplashDamage, UnlimitedAmmo, WeaponJam, AdvanceMode, ArmorMode, etc.) were
silently ignored on every Load File click.
Fix: move the ~70-line handler to the 'if (sender == @conlobby@)' block,
alongside MAIL_SET_ROOKIE_MISSION and MAIL_PREVIOUS_MISSION — where all
ConLobby-originated mails are handled. No rebuild required (script only).