Stale vendor/ after the PSR-4 cutover omits AKSRT\ from
autoload_psr4, so helpers fatal on DomainModel constants.
Fail loud with composer install/dump-autoload guidance and
document the deploy step in README + ADR.
Move 288 types from global AKSRT_* + inc/classes manual requires into
namespace AKSRT\{Domain} under src/AKSRT/, wire composer.json psr-4,
and slim bootstrap to helpers/modules/hooks only. Split multi-class
widget/gateway files, update admin contract audit paths, and document
the layout in ADR/README.