Build an in-game settings page for a Helldivers 2 mod with the ModOptionsMenu (MOM) framework — the real registration contract, the two types it accepts, the 2-16 option limit, index-valued choices, and the single-owner rule for two controls writing one setting. Use when a mod needs user-facing options, when options silently fail to appear, or when a value changes in the page but nothing happens in game.
