Bloque 2: eliminar codi mort comentat (shape_manager, engine)
Bloque 3: Engine shape methods com thin wrappers a ShapeManager;
eliminar estat duplicat de shapes en Engine
Bloque 4: encapsular getBallsMutable() amb helpers a SceneManager
(enableShapeAttractionAll, resetDepthScalesAll)
Bloque 5: StateManager Phase 9 - tota la logica DEMO/LOGO
implementada directament amb refs a SceneManager,
ThemeManager i ShapeManager; eliminar callbacks a Engine.
Acoplament Engine<->StateManager passa a unidireccional.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Sergio Valor
821eba3483