MSC: MovieScenes Curated — verified groundtruth and curation metadata for movie scene segmentation

Groundtruth annotations, dataset-curation metadata, and per-movie verification material for MSC (MovieScenes Curated), a verified 54-movie subset of the MovieScenes 64-movie test split used for multimodal movie scene segmentation. Contents: verified shot/scene boundary annotations (shots_trust.csv / scenes_trust.csv), the excluded-video log with per-movie groundtruth issues (excluded_videos.csv), structured per-movie metadata including the specific BBFC-classified commercial release each movie's frame count corresponds to (msc_manifest.csv / msc_manifest.json), a download guide with reference SHA-256 checksums (docs/download_guide.md), low-resolution verification frames, and the scripts used to build and verify the dataset. Source videos themselves are not redistributed (copyright); see docs/download_guide.md for how to source and verify a compatible copy of each movie. Code (scripts) is released under MIT; annotation and metadata files are released under CC BY 4.0 -- see LICENSE and LICENSE-DATA. Companion model code: vivit-seg (private at time of archival).