Hours after landing a massive tax windfall, AT&T, Comcast, Wells Fargo and Boeing — among other major companies — announced plans Wednesday to share a fraction of their bounty with workers. The moves pleased President Donald Trump, who has claimed his $1.5 trillion in tax cuts that largely favor the wealthy and businesses would ultimately help the middle class. But Democratic lawmakers and corporate watchdogs say the move is a public relations stunt that pales in comparison to the profits the companies’ shareholders and executives will reap because of the lower tax rates. The stock market, as well, has risen...