GRINDER TYPE list on the Omniprocessor and hydraulic mills; swapping it removes the end game #413

layout.js grinderBox runs for every comminution machine, including omni, colloid, homog and atomizer, none in PICK_GRINDERS, so no 'on the line' row and 13 swap options. Swapping the Omniprocessor shelves it and rewires stations on its per-material ports (omni:steel -> hammer:steel, 0 t), silently removing the end game. Fix: grinderOptions returns null and swapGrinder refuses unless old.m is in PICK_GRINDERS. Related: on an omni line THE BIN scene reads 'empty · Load a lot' mid-run (no omni:product port) and the run walk spends half the batch there; skip the BIN scene when the grinder has no product port.