Variable.MULTISIG_BATCH_MAX_LEGS

const MULTISIG_BATCH_MAX_LEGS: 20 = 20;

Most legs one transfer lot accepts. One signature covers the whole lot whatever its size; the cap bounds the phone screen and the gas of the atomic batch — far below the contract's own MAX_RELAYED_BATCH of 64. Single source for the DTO bound, the service guard and the admin wizard.