M1d: creatures, hunting, weapons, food buffs and the hide cloak

- Rabbits, deer and boars with procedural meshes and animated legs, a
  state machine (idle/wander/flee/charge/dead) and heightmap steering that
  avoids water, cliffs, the world edge, trees and buildings
- Spawner keeps a habitat-based budget around the player (6/4/3)
- Melee needs a weapon or tool (club, spear, axe, pickaxe); box sweep hits
- Wooden spear (thrust or throw) and crude bow with draw-scaled arrows;
  projectiles stick in the world as saved pickups
- Carcasses: E to butcher for meat, hide and embedded arrows
- Boars charge and gore when hit; hurt flash and a brief healing pause
- Cooked meat gives Well fed (faster stamina and healing); buffs saved
- Hide cloak: wear for warmth, saved, goes in the grave on death
- Feathers as meadow pickups (appended, existing save ids unchanged)
- New test_creatures_combat suite; run_all.sh gets a per-suite time limit

scripts/world/pickup.gd

@@ -25,18 +25,24 @@ func setup(id: String, mesh: Mesh, material: Material, radius: float) -> void:
 	add_child(cs)
 
 func interact_prompt(_player: Node) -> String:
-	return "[E] Pick up %s" % ItemDB.item_name(item_id)
+	return "[E] Pick up %s%s" % [ItemDB.item_name(item_id), " x%d" % amount if amount > 1 else ""]
 
 func interact(player: Node) -> void:
 	Actions.pickup(player, self)
 
 signal taken_now(pickup: Node)
 
+var dropped := false  ## dropped by the player (arrows, spears): saved, never regrows
+
 ## Picked up: hidden (not freed) so it can reappear later (props.gd regrowth).
+## Dropped items just go.
 func collected() -> void:
 	if taken:
 		return
 	taken = true
+	if dropped:
+		queue_free()
+		return
 	visible = false
 	collision_layer = 0
 	taken_now.emit(self)