chore: update IngestionService TODO comments for attributes wiring

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

cameleer3-server-core/src/main/java/com/cameleer3/server/core/ingestion/IngestionService.java

@@ -107,7 +107,7 @@ public class IngestionService {
                 diagramHash,
                 exec.getEngineLevel(),
                 inputBody, outputBody, inputHeaders, outputHeaders,
-                null // attributes: populated once cameleer3-common exposes getAttributes()
+                null // TODO: toJson(exec.getAttributes()) — awaiting cameleer3-common publish
         );
     }
 
@@ -128,7 +128,7 @@ public class IngestionService {
                     p.getErrorMessage(), p.getErrorStackTrace(),
                     truncateBody(p.getInputBody()), truncateBody(p.getOutputBody()),
                     toJson(p.getInputHeaders()), toJson(p.getOutputHeaders()),
-                    null // attributes: populated once cameleer3-common exposes getAttributes()
+                    null // TODO: toJson(p.getAttributes()) — awaiting cameleer3-common publish
             ));
             if (p.getChildren() != null) {
                 flat.addAll(flattenProcessors(