Forced Attacks Cannot Reselect

Thantis, the Warweaver forces all creatures to attack every turn. No player can re-select an attacker if desired. Creatures such Toski, Bearer of Secrets will allow the untap and re-select even though it is forced. Can this be changed?

No file, test, or entry point is named. Start by reproducing the forced-attack interaction involving Thantis, Toski, and attacker selection, then trace the relevant game-rule handling; done means forced attackers cannot be reselected while valid untap behavior remains intact.

Written by the indexing model from the issue text.