Anchor fix: use the ENTIRE first segment (before the first transition word)
as the character anchor for all windows. Previous code split at the first
comma, which broke prompts like "In this anime video, Character is a..."
by using "In this anime video" as the anchor and losing the character desc
from all subsequent windows.
i2v fix: in FunPackSceneCutWindows, scene N>0 tokens now have access to
scene 0's tokens as key/value (in addition to their own scene). The i2v
guide frame lives in the early temporal positions (scene 0 region), so
blocking it from later scenes caused the reference image to be ignored.
Scenes 1 and 2+ remain isolated from each other.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
