Mid-soundcheck, 17:40: the decolle backdrop stayed up through Salut Nu and
Chere Mireille. Not a stale scene — Chere Mireille does declare one, and it
parses fine quoted or bare. Its FILE was gone: both PerfectSunriseLoop.gif
and rose_bloom.gif had been cleaned out of ~/Downloads, so the resolver
returned nothing and the HUD kept painting the last scene that worked.

The converted mp4s were never lost — they live in visuals/scenes, which is
where scene-ingest writes them. Repointed chere_mireille, sept1 and
rose_rouge at those, by absolute path: an mp4 passes the guard as video with
no size limit and no derived-twin lookup, where the raw gif would have been
refused anyway (decolle.gif is 797MB).

Downloads is a staging area, not a source of truth. A backdrop that lives
there dies the next time it is tidied.