feat(mafia): the Afia oil ad rides again — scene header points at its GLITCHWAVE source

The glitch loop cut live from the Afia ad (afia_flow.gif) is now this
track's backdrop, through the HUD's new standard: the header names the
source, scene-ingest derives the playable twin into visuals/scenes/.

live/collab/raph/mafia_sans_serif.tidal

+-- url: "/home/pln/Work/Art/GLITCHWAVE/afia_flow.gif"
+
 -- TODO(pan): this track is very nearly MONO. Measured on the OPAL-26 master
 -- (2026-08-08, 1:01:22-1:04:33): stereo width 0.05 (side/mid RMS) against a
 -- set median of ~0.20 — the narrowest thing in the whole 1h20. It is also the