feat: Add attackCooldown to animals and weapon check for soldiers

entities.js

@@ -24,7 +24,7 @@ function createCitizen(name, x, y, forcedProfession=null) {
     energy: ENERGY_MAX,
     health: HEALTH_MAX,
     education: 0,
-    hasWeapon: false
+    hasWeapon: profession === "Soldier" // Soldiers start with a weapon
   };
 }
 
@@ -107,7 +107,8 @@ function createAnimal(type, x, y) {
     vy: (Math.random() - 0.5) * 0.4,
     hunger: 0,
     dead: false,
-    reproductionCooldown: cd
+    reproductionCooldown: cd,
+    attackCooldown: 0
   };
 }