Bradfield in Sydney’s affluent north shore is shaping up as the scene of one of the federal election’s most fiercely fought teal v Liberal battles. Nicolette Boele, a community independent, is taking on the star Liberal candidate Gisele Kapterian. It’s Boele’s second shot at winning the seat, having run against the Liberal MP, Paul Fletcher – who is now retiring – and reducing his margin to just 4.2%. In a contest this tight every vote matters. That’s why the decision by another independent, Andy Yin, a former Liberal party insider,…