label the wave v2 dataset manifest dispatch_wave_v2 (the chain hard-gates on it)

extensions/wave_v2/data/dataset_manifest.json

@@ -1,5 +1,5 @@
 {
-  "version": "dispatch_wave_v1",
+  "version": "dispatch_wave_v2",
   "seed": 20260812,
   "margin_band": [
     0.25,
@@ -254,4 +254,4 @@
     }
   },
   "conflict_pool_overlaps_eval": 0
-}
+}