Reth v2.5.0 Cuts Mainnet Latency

Reth v2.5.0 cuts mainnet block-processing latency 5-10% vs v2.4.1. Opt-in txpool prewarming delivers 7% mean latency reduction; sender-recovery cache adds 3%. Adds snap/2 serving, eth_getMultiProof, partial trie persistence. Fixes devp2p Hello identity binding. Rollback requires v2.4.1 after v2.5.x. revm 42.0.1, alloy 2.3.0.