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Vance Ingalls
f0c0ef1037
Expands the regression composition to better cover the SDR-opacity fix and to read more clearly when reviewing the rendered output: * Replace the previous 36-byte placeholder media (Git LFS pointers that were never resolved on disk) with real BT.2020 PQ clips drawn from a YouTube HDR demo (M8hv1Oah2uQ) and BT.709 SDR clips drawn from a YouTube SDR sample (SnUBb-FAlCY). Total ~40 MB of binaries — kept inline rather than tracked through LFS so the fixture matches the rest of the hdr-regression suite. * Add `data-start` / `data-duration` to every HUD slate, caption, and overlay element so they actually reach the layered compositor during their owning scene window. Without these the elements were computed off-stage by the renderer and the slates / pip captions in scenes 1 and 2 never appeared in the final video. * Paint scene 6 on a white field so an opacity yoyo on a framed clip is visible — on the default near-black root the dip-to-translucent reads as no change at all. * Drop opacity from the scene-6 transform yoyo on `#s6-f3`. Earlier scenes already cover the opacity-yoyo path; scene 6 is now a dedicated transform showcase (entry opacity fade-in stays so the clip enters cleanly). Made-with: Cursor