Brian Armstrong, chief executive officer of Coinbase Global Inc., speaks during the Messari Mainnet summit in New York, on Thursday, Sept. 21, 2023.Coinbase is making its biggest push yet to reposition itself as a mainstream trading and financial platform, moving beyond crypto and into the broader retail investing stack as competitors show there's real money in always-on engagement products.The digital asset exchange announced Wednesday that it's rolling out a major slate of new products designed to turn Co ...