Despite the robust metrics of the overall Long Island housing market this quarter, there was more weakness evident in the luxury market, representing the top 10% of all sales. In the overall housing market, sales edged up 1.1% to 6,763, the highest total for a second quarter in thirteen years. Listing inventory fell 13.8% to 11,544 to the lowest second-quarter supply total in fifteen years. With the pronounced decline in listing inventory and a modest rise in sales, the…