Sean Anthony Eddy/Getty Images Coinbase and other tech companies want fewer managers — and ones who can act as "player-coaches." Managers who don't do any individual contributor work are especially vulnerable. Those who survive layoffs are being tasked with overseeing AI agents — and more workers. Managers who don't produce are becoming expendable. As tech layoffs roll on and org charts flatten, some industry leaders are sending them a sharp directive: Keep tabs on your reports, but be sure to