Make MB_MINION_SPAWN_TIME a required ConfigManager entry

0 or blank keeps the normal guard/siege minion spawn timers.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/engine/gameManager/ConfigManager.java

@@ -75,6 +75,7 @@ public enum ConfigManager {
     // Mobile AI modifiers
     MB_AI_CAST_FREQUENCY,
     MB_AI_AGGRO_RANGE,
+    MB_MINION_SPAWN_TIME,
 
     //drop rates
     MB_NORMAL_EXP_RATE,

src/engine/objects/Mob.java

@@ -41,9 +41,6 @@ import static java.lang.Math.toIntExact;
 public class Mob extends AbstractIntelligenceAgent implements Delayed {
 
     private static int staticID = 0;
-
-    // Optional env var (seconds) to shorten guard/siege minion spawns for testing; not in the ConfigManager enum, which requires every entry.
-    private static final String MINION_SPAWN_TIME_FLAG = "MB_MINION_SPAWN_TIME";
     //mob specific
     public final ConcurrentHashMap<Integer, Float> playerAgroMap = new ConcurrentHashMap<>(); //key = Player value = hate value
 
@@ -439,21 +436,28 @@ public class Mob extends AbstractIntelligenceAgent implements Delayed {
         return mobile;
     }
 
+    // MB_MINION_SPAWN_TIME (seconds) shortens guard/siege minion spawns for testing; 0 or blank keeps the normal timers.
     private static int minionSpawnDelay(int defaultDelay) {
 
         String overrideValue;
+        int overrideDelay;
 
-        overrideValue = ConfigManager.configMap.get(MINION_SPAWN_TIME_FLAG);
+        overrideValue = ConfigManager.MB_MINION_SPAWN_TIME.getValue();
 
-        if (overrideValue == null || overrideValue.isEmpty())
+        if (overrideValue == null || overrideValue.trim().isEmpty())
             return defaultDelay;
 
         try {
-            return Integer.parseInt(overrideValue.trim());
+            overrideDelay = Integer.parseInt(overrideValue.trim());
         } catch (NumberFormatException e) {
-            Logger.warn(MINION_SPAWN_TIME_FLAG + " is not a number: " + overrideValue);
+            Logger.warn("MB_MINION_SPAWN_TIME is not a number: " + overrideValue);
             return defaultDelay;
         }
+
+        if (overrideDelay <= 0)
+            return defaultDelay;
+
+        return overrideDelay;
     }
 
     public static synchronized Mob createGuardMinion(Mob guardCaptain, short level, String minionName) {