Devnet-8 Updates Spark EL, CL Debates on Bids, Caches

ACDT #90, August 3: devnet-7/8 status updates, repricings discussed. EL proposes discv5-only support on devnet-8, using BAL data for hot state cache post-snap-sync. CL debates direct builder specs, bid handling for insufficient balances, and ignoring parent bids at epoch boundaries.