Why is my views filter handler not appearing in the list?

i am working on porting views_raw_sql to D8. I got the raw field working rather easily. However, I cannot for the life of me get a sort, filter, or argument to appear in the list of available options. 

My module.views.inc file contains the line

$data['views_raw_sql_8']['raw_sort'] = [
    'title' => t('Raw Argument'),
    'help' => t('Provide raw SQL contextual filter.'),
    'sort' => [
      'id' => 'sort_views_raw_sql_8',

inside hook_views_data()

also I have a file: root/src/Plugin/views/sort/RawSQLSort.php that is a nearly line-by-line copy of the standard sort:

namespace Drupalviews_raw_sql_8Pluginviewssort;

use DrupalviewsPluginviewssortSortPluginBase;

 * Default implementation of a raw SQL sort plugin.
 * @ingroup views_sort_handlers
 * @ViewsSort("sort_views_raw_sql_8")
class RawSQLSort extends SortPluginBase {


The full code is at http://cgit.drupalcode.org/sandbox-Beakerboy-2922663/tree/

Any advice on what I’m missing to get this sort to show up in the list of available options so I can begin to fill in and test the functionality? My code currently passes pareview with no warnings or errors.

Drupal version: 

Source: https://www.drupal.org/taxonomy/term/4/feed