FreshHarvestActions inherited from itself to graft on basket switching, which is legal Python and a trap. BasketMixin now sits above it and is inherited normally. The four control platforms each carried an identical private _fire; it moves to the base entity as fire_action. Rewriting those call sites mechanically broke two of them - select fired 'donate' instead of 'change_basket', and button lost an argument entirely, a TypeError reachable only by pressing it. Both fixed, and two tests now assert call arity and that no class inherits from itself, because neither fault is reachable from a unit test.