svs: change SVS v3 prefix announcement name

named-data/StateVectorSync#21

Author: yoursunny

pkg/svs/README.md

@@ -8,10 +8,11 @@ This package contains **StateVectorSync** and related protocols, including:
   * deprecated, enable with `svs3: false` option
   * partial unit test
   * core synchronization logic only, does not deal with Data fetching
-* [StateVectorSync v3](https://named-data.github.io/StateVectorSync/Specification.html), revision 2025-01-14
+* [StateVectorSync v3](https://named-data.github.io/StateVectorSync/Specification.html), revision 2026-07-17
   * complete unit test
   * core synchronization logic only, does not deal with Data fetching
 * [SVS-PS](https://named-data.github.io/StateVectorSync/PubSubSpec.html), revision 2025-01-04
+  * only validated with SVS v2 (`svs3: false` option)
   * simple unit test
   * piggyback MappingData feature is not supported
 

pkg/svs/src/sync.ts

@@ -87,7 +87,12 @@ export class SvSync extends TypedEventTarget<EventMap> implements SyncProtocol<S
       describe: this.describe,
       routeCapture: false,
     });
-    this.face.addRoute(this.syncDataName, this.groupPrefix);
+
+    if (this.svs3) {
+      this.face.addRoute(this.syncDataName);
+    } else {
+      this.face.addRoute(this.syncDataName, this.groupPrefix);
+    }
   }
 
   private readonly maybeHaveEventListener = trackEventListener(this);