Coppelius.Build.Graph

---- submissions ---- Each submission is a list of ranges of the launch order (adjacent ranges merged) and its semaphore slot, one per submission. The phases' launch counts place them: initialize; for every checkpoint chunk but the last, its default save then its load; the last save; the last load with the half copies; the prediction; the update (its shared part, its AdamW, the half copies, its loss-record copy); the final forward; every save chunk; the report put back. The host issues the update once per step and the save chunks at every checkpoint (Coppelius.Build.NativeHost).

2669def cgChunks : Nat =
2670  (cgCeilDivide cgCheckpointBytes cgChunkBytes)