alerting(eval): EvalResult.Batch carries nextEvalState for cursor threading

cameleer-server-app/src/main/java/com/cameleer/server/app/alerting/eval/AgentLifecycleEvaluator.java

@@ -64,13 +64,13 @@ public class AgentLifecycleEvaluator implements ConditionEvaluator<AgentLifecycl
         List<AgentEventRecord> matches = eventRepo.findInWindow(
                 envSlug, appSlug, agentId, typeNames, from, to, MAX_EVENTS_PER_TICK);
 
-        if (matches.isEmpty()) return new EvalResult.Batch(List.of());
+        if (matches.isEmpty()) return new EvalResult.Batch(List.of(), Map.of());
 
         List<EvalResult.Firing> firings = new ArrayList<>(matches.size());
         for (AgentEventRecord ev : matches) {
             firings.add(toFiring(ev));
         }
-        return new EvalResult.Batch(firings);
+        return new EvalResult.Batch(firings, Map.of());
     }
 
     private static EvalResult.Firing toFiring(AgentEventRecord ev) {

cameleer-server-app/src/main/java/com/cameleer/server/app/alerting/eval/EvalResult.java

@@ -17,9 +17,14 @@ public sealed interface EvalResult {
 
     record Error(Throwable cause) implements EvalResult {}
 
-    record Batch(List<Firing> firings) implements EvalResult {
+    record Batch(List<Firing> firings, Map<String, Object> nextEvalState) implements EvalResult {
         public Batch {
             firings = firings == null ? List.of() : List.copyOf(firings);
+            nextEvalState = nextEvalState == null ? Map.of() : Map.copyOf(nextEvalState);
+        }
+        /** Convenience: a Batch with no cursor update (first-run empty, or no matches). */
+        public static Batch empty() {
+            return new Batch(List.of(), Map.of());
         }
     }
 }

cameleer-server-app/src/main/java/com/cameleer/server/app/alerting/eval/ExchangeMatchEvaluator.java

@@ -116,7 +116,7 @@ public class ExchangeMatchEvaluator implements ConditionEvaluator<ExchangeMatchC
         SearchResult<ExecutionSummary> result = searchIndex.search(req);
         List<ExecutionSummary> matches = result.data();
 
-        if (matches.isEmpty()) return new EvalResult.Batch(List.of());
+        if (matches.isEmpty()) return new EvalResult.Batch(List.of(), Map.of());
 
         // Find the latest startTime across all matches — becomes the next cursor
         Instant latestTs = matches.stream()
@@ -144,6 +144,6 @@ public class ExchangeMatchEvaluator implements ConditionEvaluator<ExchangeMatchC
             firings.add(new EvalResult.Firing(1.0, null, ctx2));
         }
 
-        return new EvalResult.Batch(firings);
+        return new EvalResult.Batch(firings, Map.of());
     }
 }