fix: write has_trace_data to OpenSearch document during indexing

The toMap() method was missing the has_trace_data field, so it was
never indexed despite being read back in hitToSummary().

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

cameleer3-server-app/src/main/java/com/cameleer3/server/app/search/OpenSearchIndex.java

@@ -361,6 +361,7 @@ public class OpenSearchIndex implements SearchIndex {
                 return pm;
             }).toList());
         }
+        map.put("has_trace_data", doc.hasTraceData());
         return map;
     }