GraphCast: Learning skillful medium-range global weather forecasting

Round-12 hunt: picked (round-10 provenance hold cleared on a round-12 uploader check of video descriptions); channel-level screens (sellers/exam/re-upload/devotional/vendor/events), provenance check, vendor/seller/devotional recheck and quality ranking (tier A) passed; strict per-title check + final strict pass; oEmbed verified.