Mayor Zohran Mamdani’s controversial, $54 million “Office of Mass Engagement” repeatedly spammed New Yorkers with Hizzoner-branded pleas to vote leading up to the primaries this week, in what some critics called a barely legal campaign that had little effect on turnout. The newly created unit — which has been slammed as a “propaganda office” — spent weeks emailing and texting Big Apple voters with reminders about the June primaries that was denounced by some as a publicly funded electioneering