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Right strength curve (level 1-4 -> increasing img2img keyframe strength) is pure and unit-tested; the restyle engine is a verbatim port of the session-0008 POC flow_restyle.py (SD img2img keyframes + Farneback optical-flow tweens = calm, no boiling). torch/diffusers imported lazily so the module + curve test stay light. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>