Normalize parent-only MM submit telemetry

src/merge_mining_proxy/merge_mining_proxy.cpp

@@ -723,9 +723,14 @@ bool merge_mining_proxy::submit_parent_block(const cryptonote::COMMAND_RPC_SUBMI
     return false;
   if (res.status != CORE_RPC_STATUS_OK)
   {
+    res.parent_accepted = false;
     MERROR("submit_parent_block: parent daemon returned status=" << res.status << ", block_id=" << res.block_id);
     return false;
   }
+  // Normalize parent-only submits so pool telemetry does not have to infer
+  // acceptance from a bare parent daemon response.
+  res.parent_accepted = true;
+  res.parent_height = 0;
   return true;
 }