Post-hoc sprite removal is a losing battle (three inpainting strategies
failed QC on letter-edge overlap frames). The production answer: sprites
are BillboardComponent/SpriteComponent/ArrowComponent subobjects — set
bVisible:false via ObjectTools (remove_component fails on default
subobjects), swept scene-wide in one ProgrammaticToolset script
(148 actors, 13 sprites, one round-trip, verified).
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