Tired of Trump’s new $500-per-head tariff on illegal border crossings, Mexico’s top coyotes are threatening a walkout. “We’re essential workers—where’s our bailout?” demanded Maria “La Loba” Sanchez, pacing a tunnel stocked with knockoff Nikes. The tariff, aimed at curbing ‘human dumping,’ has coyotes scrambling to offset losses, with some offering ‘smuggle now, pay later’ deals.…