Optimize path following further following Daniel's leads: - support full batching, serial path no longer needed even if some NPCs can swim or open doors, move requests are queued for next batch - better use of unity's TransformAccessArray to avoid native overhead (don't set to null, do not re-build every batch instead persistent w stable identities) - iterate forward instead of backward (ListHashSet is slower backward, + has RemoveUnordered so iterating backward to delete is not really needed) - skip IsUnityNull checks that's no longer needed