It’s a poor Mam who blames his tools. Mayor Zohran Mamdani served up plenty of finger-pointing, but few details Wednesday on his plans to plug the city’s massive upcoming $12 billion budget hole — other than again calling on Gov. Kathy Hochul to tax the rich. A stern Mamdani gave a doom-and-gloom address from City Hall’s Blue Room that wasted no time blaming his predecessor Eric Adams and rival former Gov. Andrew Cuomo for the budget crunch threatening his expensive socialist agenda. “New York