Add B200 to the device-reference mappings across the SSIM suite and migrate
test_gen3c_similarity.py onto the shared reference_utils helpers (device
resolution, tiered output/reference layout, full-quality param selection,
executor shutdown in try/finally). Add run_parallel.py, a local scheduler
that mirrors the Modal static discovery and packs one-, two-, and four-GPU
SSIM jobs onto disjoint CUDA_VISIBLE_DEVICES sets, with per-task logs, JUnit
XML, and a summary.json under generated_videos/<tier>/_runs/. Verified: all
files compile and --dry-run discovers all 19 tasks with correct GPU sizing
against current main. Full-quality B200 references generated on GB200 are
uploaded to the HF reference repo separately.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
