Add /lw speed command for real-time simulation acceleration

/lw speed <1-20>  — run N full sim cycles (module pipeline + all
                    post-sim hooks) per normal tick interval.
/lw speed reset   — return to real-time (1x).

The multiplier is stored on LivingWorldBootstrap and reset to 1 on
server stop. Extra cycles queue all active regions and call the full
post-sim hook chain (pollution spread, seasonal effects, climate,
warming, water runoff, dynamic cap) so ecosystem state advances
coherently rather than just running modules in isolation.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/main/java/com/livingworld/bootstrap/LivingWorldBootstrap.java

@@ -10,6 +10,7 @@ import com.livingworld.core.services.ServiceRegistry;
 import com.livingworld.core.simulation.DefaultTimeService;
 import com.livingworld.core.simulation.SimulationManager;
 import com.livingworld.core.simulation.SimulationScheduler;
+import com.livingworld.core.simulation.UpdateReason;
 import com.livingworld.debug.SimulationProfiler;
 import com.livingworld.debug.DiagnosticCategory;
 import com.livingworld.debug.LivingWorldLogger;
@@ -90,6 +91,8 @@ public final class LivingWorldBootstrap {
     private boolean serverReady;
     /** Average surface elevation (block Y) per region, sampled once by the platform layer. */
     private final Map<RegionCoordinate, Double> regionElevations = new HashMap<>();
+    /** Extra sim cycles run per normal tick interval (1 = real-time, >1 = accelerated). */
+    private int simSpeedMultiplier = 1;
 
     /**
      * Called once during mod construction.
@@ -212,6 +215,7 @@ public final class LivingWorldBootstrap {
         climateTracker.save(worldSaveDirectory.resolve("living_world/global_climate.dat"));
         hudEnabledPlayers.clear();
         regionElevations.clear();
+        simSpeedMultiplier = 1;
         serverReady = false;
         LivingWorldLogger.info(
                 DiagnosticCategory.BOOTSTRAP,
@@ -343,16 +347,38 @@ public final class LivingWorldBootstrap {
         long previousSimulationTick = simulationManager.getSimulationTickCounter();
         simulationManager.onMinecraftServerTick();
         if (simulationManager.getSimulationTickCounter() != previousSimulationTick) {
-            spreadPollutionAcrossRegions();
-            applySeasonalEffects();
-            climateTracker.update(regionManager.getActiveRegions());
-            applyClimateWarmingEffects();
-            applyWaterRunoff();
-            applyDynamicCapUpdate();
+            runPostSimHooks();
+            for (int extra = 1; extra < simSpeedMultiplier; extra++) {
+                for (Region r : regionManager.getActiveRegions()) {
+                    simulationManager.queueRegionForUpdate(
+                            r.getCoordinate(), 0, UpdateReason.NORMAL_ROLLING_UPDATE);
+                }
+                simulationManager.runSimulationCycle();
+                runPostSimHooks();
+            }
             regionManager.saveDirtyRegions();
         }
     }
 
+    private void runPostSimHooks() {
+        spreadPollutionAcrossRegions();
+        applySeasonalEffects();
+        climateTracker.update(regionManager.getActiveRegions());
+        applyClimateWarmingEffects();
+        applyWaterRunoff();
+        applyDynamicCapUpdate();
+    }
+
+    /** Sets the simulation speed multiplier (1 = real-time, max 20). */
+    public int setSimSpeedMultiplier(int multiplier) {
+        this.simSpeedMultiplier = Math.max(1, Math.min(20, multiplier));
+        LivingWorldLogger.info(DiagnosticCategory.BOOTSTRAP,
+                "Simulation speed set to " + simSpeedMultiplier + "x");
+        return this.simSpeedMultiplier;
+    }
+
+    public int getSimSpeedMultiplier() { return simSpeedMultiplier; }
+
     private static final double POLLUTION_SPREAD_RATE = 0.02;
 
     private void spreadPollutionAcrossRegions() {
@@ -635,7 +661,8 @@ public final class LivingWorldBootstrap {
                 () -> requireService(simulationManager, "simulationManager"),
                 this::toggleHud,
                 this::getAtmosphereStatusFor,
-                this::getClimateStatusFor);
+                this::getClimateStatusFor,
+                this::setSimSpeedMultiplier);
     }
 
     public Path getWorldSaveDirectory() {

src/main/java/com/livingworld/commands/LivingWorldCommandRoot.java

@@ -2,6 +2,7 @@ package com.livingworld.commands;
 
 import java.util.UUID;
 import java.util.function.Function;
+import java.util.function.IntUnaryOperator;
 import java.util.function.Supplier;
 import java.util.stream.Collectors;
 
@@ -41,7 +42,8 @@ public final class LivingWorldCommandRoot {
                 () -> simulationManager,
                 uuid -> false,
                 css -> "Atmosphere not available.",
-                css -> "Climate not available.");
+                css -> "Climate not available.",
+                n -> n);
     }
 
     public static void registerDeferred(
@@ -51,7 +53,8 @@ public final class LivingWorldCommandRoot {
             Supplier<SimulationManager> simulationManager,
             Function<UUID, Boolean> hudToggle,
             Function<CommandSourceStack, String> atmosphereStatus,
-            Function<CommandSourceStack, String> climateStatus) {
+            Function<CommandSourceStack, String> climateStatus,
+            IntUnaryOperator speedSetter) {
         if (dispatcher == null) {
             throw new IllegalArgumentException("dispatcher must not be null");
         }
@@ -122,6 +125,24 @@ public final class LivingWorldCommandRoot {
                             context.getSource().sendSuccess(() -> Component.literal(info), false);
                             return 1;
                         }))
+                .then(Commands.literal("speed")
+                        .then(Commands.argument("multiplier", IntegerArgumentType.integer(1, 20))
+                                .executes(context -> {
+                                    int n = IntegerArgumentType.getInteger(context, "multiplier");
+                                    int actual = speedSetter.applyAsInt(n);
+                                    context.getSource().sendSuccess(
+                                            () -> Component.literal("[LW] Simulation speed: " + actual + "x"),
+                                            false);
+                                    return actual;
+                                }))
+                        .then(Commands.literal("reset")
+                                .executes(context -> {
+                                    speedSetter.applyAsInt(1);
+                                    context.getSource().sendSuccess(
+                                            () -> Component.literal("[LW] Simulation speed reset to 1x"),
+                                            false);
+                                    return 1;
+                                })))
                 .then(RegionSetCommand.build(regionManager)));
     }