Set T4 manifest track identity

Copy files from datasets/when665/WxFlowBench

Upload T3-T4 prerelease lineage and source data

Update README.md

Set T2 manifest track identity

Copy files from datasets/when665/WxFlowBench

Upload T1 US prerelease package v4

Upload T0 run006 prerelease and bound data

Document T0-T4 prerelease snapshot

initial commit