Add region info command

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

@@ -48,8 +48,8 @@ public final class LivingWorldCommandRoot {
                                 context.getSource(), regionManager, moduleRegistry, simulationManager)))
                 .then(Commands.literal("region")
                         .then(Commands.literal("info")
-                                .executes(context -> placeholder(
-                                        context.getSource(), "Region inspection is not connected yet."))))
+                                .executes(context -> RegionInfoCommand.execute(
+                                        context.getSource(), regionManager))))
                 .then(Commands.literal("modules")
                         .then(Commands.literal("list")
                                 .executes(context -> listModules(

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

@@ -0,0 +1,44 @@
+package com.livingworld.commands;
+
+import net.minecraft.commands.CommandSourceStack;
+import net.minecraft.network.chat.Component;
+import net.minecraft.world.phys.Vec3;
+
+import com.livingworld.regions.Region;
+import com.livingworld.regions.RegionManager;
+
+/**
+ * Prints the Living World region state at the command source position.
+ */
+public final class RegionInfoCommand {
+
+    private RegionInfoCommand() {
+    }
+
+    public static int execute(
+            CommandSourceStack source,
+            RegionManager regionManager) {
+        if (source == null) {
+            throw new IllegalArgumentException("source must not be null");
+        }
+        if (regionManager == null) {
+            throw new IllegalArgumentException("regionManager must not be null");
+        }
+
+        Vec3 position = source.getPosition();
+        String dimensionId = source.getLevel().dimension().location().toString();
+        Region region = regionManager.getOrCreateRegionAtBlock(
+                dimensionId,
+                floorToBlock(position.x),
+                floorToBlock(position.z));
+
+        for (String line : RegionInfoFormatter.format(region)) {
+            source.sendSuccess(() -> Component.literal(line), false);
+        }
+        return 1;
+    }
+
+    private static int floorToBlock(double coordinate) {
+        return (int) Math.floor(coordinate);
+    }
+}

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

@@ -0,0 +1,46 @@
+package com.livingworld.commands;
+
+import java.util.List;
+import java.util.Set;
+import java.util.TreeSet;
+
+import com.livingworld.regions.Region;
+import com.livingworld.regions.RegionFlags;
+import com.livingworld.regions.RegionMetrics;
+
+/**
+ * Formats region diagnostics without depending on Minecraft classes.
+ */
+public final class RegionInfoFormatter {
+
+    private RegionInfoFormatter() {
+    }
+
+    public static List<String> format(Region region) {
+        if (region == null) {
+            throw new IllegalArgumentException("region must not be null");
+        }
+
+        RegionMetrics metrics = region.getMetrics();
+        RegionFlags flags = region.getFlags();
+        Set<String> moduleIds = new TreeSet<>(region.getModuleData().moduleIds());
+
+        return List.of(
+                "Region: " + region.getCoordinate().stableId(),
+                "Lifecycle: " + region.getLifecycleState() + ", dirty=" + region.isDirty(),
+                "Metrics: ecosystemHealth=" + metrics.getEcosystemHealth()
+                        + ", pollution=" + metrics.getPollutionScore()
+                        + ", soilQuality=" + metrics.getSoilQuality()
+                        + ", waterQuality=" + metrics.getWaterQuality()
+                        + ", vegetationPressure=" + metrics.getVegetationPressure()
+                        + ", resourceDepletion=" + metrics.getResourceDepletion()
+                        + ", recoveryPressure=" + metrics.getRecoveryPressure(),
+                "Flags: playerActivity=" + flags.isHasPlayerActivity()
+                        + ", highPollution=" + flags.isHasHighPollution()
+                        + ", lowSoilQuality=" + flags.isHasLowSoilQuality()
+                        + ", activeEcosystemEvent=" + flags.isHasActiveEcosystemEvent()
+                        + ", forceLoaded=" + flags.isForceLoadedBySimulation()
+                        + ", corrupted=" + flags.isCorrupted(),
+                "Module data: " + (moduleIds.isEmpty() ? "none" : String.join(", ", moduleIds)));
+    }
+}

src/test/java/com/livingworld/commands/RegionInfoFormatterTest.java

@@ -0,0 +1,40 @@
+package com.livingworld.commands;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import java.util.List;
+
+import org.junit.jupiter.api.Test;
+
+import com.livingworld.regions.Region;
+import com.livingworld.regions.RegionCoordinate;
+import com.livingworld.regions.RegionFactory;
+
+class RegionInfoFormatterTest {
+
+    @Test
+    void includesIdentityLifecycleMetricsFlagsAndSortedModuleIds() {
+        Region region = new RegionFactory().createNewRegion(
+                new RegionCoordinate("minecraft:overworld", -1, 2), 0);
+        region.getMetrics().setPollutionScore(75);
+        region.getFlags().setHasHighPollution(true);
+        region.getModuleData().put("water", "data");
+        region.getModuleData().put("soil", "data");
+
+        List<String> lines = RegionInfoFormatter.format(region);
+
+        assertEquals(5, lines.size());
+        assertTrue(lines.get(0).contains("minecraft:overworld:-1:2"));
+        assertTrue(lines.get(1).contains("ACTIVE"));
+        assertTrue(lines.get(2).contains("pollution=75.0"));
+        assertTrue(lines.get(3).contains("highPollution=true"));
+        assertEquals("Module data: soil, water", lines.get(4));
+    }
+
+    @Test
+    void validatesRegion() {
+        assertThrows(IllegalArgumentException.class, () -> RegionInfoFormatter.format(null));
+    }
+}