Besu 26.7.0 Deletes Proof of Work, Speeds Up Gas Price

Besu 26.7.0 removes Proof of Work entirely—mining infrastructure, Ethash validation, and PoW RPC methods are deleted. Adds per-head fee oracle caching for faster eth_gasPrice, parallel Block Access List execution, and dedicated block-processing thread pools. Deprecates --min-block-occupancy-ratio and rpc-tx-feecap semantics change; 0 now caps fees.