Fix video spill colour selection and secondary casts (v2.5.2) - #48
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Video spill correction could treat warm material as key-coloured material and leave reflections untreated. Full correction could then amplify small colour differences into a secondary cast.
This patch uses key-hue evidence for automatic selection and bounded colour recovery for full correction, preserving alpha and the conservative mode. It also updates the package and skill to v2.5.2. Source colours outside the key hue remain unchanged.
Validation: 1,763 tests passed (one skipped), including synthetic colour-preservation and imperfect-key regressions. All 239 package checks passed after refreshing stale editable metadata. The installed wheel was exercised through both video-frames and video-loop.