Claim protection from a local index: revision-polled panel endpoint, no per-block network checks

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01DjMbLQujBHunCCu5GpsHaT

integrations/common/src/main/java/net/scopenet/integration/Integration.java

@@ -155,8 +155,14 @@ public final class Integration implements AutoCloseable {
         return client.checkChunk(dimension, chunkX, chunkZ, uuid);
     }
 
-    public void prefetchClaims(String dimension, int chunkX, int chunkZ, UUID uuid) {
-        client.prefetchClaims(dimension, chunkX, chunkZ, uuid);
+    /** Environmental protection: is this chunk claimed by anyone? */
+    public boolean isClaimed(String dimension, int chunkX, int chunkZ) {
+        return client.isClaimed(dimension, chunkX, chunkZ);
+    }
+
+    /** Begin keeping the local claim index in sync with the panel. */
+    public void startClaimSync() {
+        client.startClaimSync(log);
     }
 
     @Override public void close() {