Replace 3 separate forceInput wires (mode, trim_start, trim_end) plus mask and blend_frames with a single VACE_PIPE dict carrying mode, trim bounds, and context frame counts. SourcePrep outputs reduced from 12 to 7 (segments removed), MergeBack inputs reduced from 9 to 5. Blending now auto-derives from context counts instead of manual blend_frames. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>