Hordium

New:

• Added the "Undead Army" raid (undead_army) — 5 waves, ~163 mobs, zombies/skeletons with armor and weapon progression from stone to diamond, riders on zombie/skeleton horses (+20 HP, 0.5 speed), witches, enchanted bows (Power/Flame).
• follow_range in raid JSONs now supports three explicit states: "auto" (= raid radius), "none"/null (vanilla behavior), a number (fixed value for all mobs). Enabled ("auto") on all three standard raids.

Fixes:

• Mounted mobs (riders) no longer stand still — the horse deliberately never took a target so it wouldn't fight the rider for control, but the rider itself was never given the goal to move toward the raid center, so nothing was actually steering the horse.
• Mobs with ranged weapons (archers, crossbowmen, witches) now also head to the raid center, not just melee units — the raid-center convergence goal was losing priority to these mobs' own built-in vanilla goals (sun-avoidance, witch random wandering, etc.).