Core-dissolution direction (Captain's ruling, WO-WZ-026/027): host-side
machinery must not grow in core — the engine additions now live in cms
as backend/plugin/pongoengine (absorbed copy). Tag v0.19.1 still points
at the reverted commit; nothing consumes it. The v0.19.0 codeless
BUILDER keys stay: the ninja CLI lives here until WO-WZ-023 moves it
into cms.
This reverts commit 630dfc7dd1cd35b46482d81904f77dbbcb01c885.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>