fix pod; set status defaults; stub runner mixin

lib/App/Netdisco/Backend/Runner.pm

@@ -0,0 +1,15 @@
+package App::Netdisco::Backend::Runner;
+
+use Dancer ':moose :syntax';
+use App::Netdisco::Worker::Status;
+
+use Try::Tiny;
+use Role::Tiny;
+use namespace::clean;
+
+# mixin code to run workers loaded via plugins
+sub run {
+  return App::Netdisco::Worker::Status->new({done => true, message => 'ok'});
+}
+
+true;