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/props.gd

@@ -581,8 +581,8 @@ func _scatter_pickups() -> void:
 	var rng := RandomNumberGenerator.new()
 	rng.seed = world_seed + 6
 	# Order matters: new kinds go at the END so existing saves keep their ids.
-	var want := {"stick": 260, "stone": 170, "flint": 80, "mushroom": 110}
-	var radius: Dictionary = {"stick": 0.35, "stone": 0.25, "flint": 0.25, "mushroom": 0.25}
+	var want := {"stick": 260, "stone": 170, "flint": 80, "mushroom": 110, "feather": 70}
+	var radius: Dictionary = {"stick": 0.35, "stone": 0.25, "flint": 0.25, "mushroom": 0.25, "feather": 0.25}
 	for id: String in want:
 		var mesh := ItemDB.mesh_for(id)
 		var placed := 0
@@ -608,6 +608,8 @@ func _scatter_pickups() -> void:
 					chance = 0.06 + shore * 0.9 + (1.0 - n.y) * 2.0
 				"mushroom":
 					chance = _forest(x, z) * 0.7   # deep forest only
+				"feather":
+					chance = 0.1 + (1.0 - _forest(x, z)) * 0.5   # open meadows
 			# A few right by the spawn so the first craft is quick.
 			if Vector2(x - _spawn.x, z - _spawn.z).length() < 18.0:
 				chance += 0.5