For most media outlets outside the Annapolis, Md., area, intense coverage of the Naval Academy athletic program begins sometime in early December and ends immediately after the ritual gridiron-based thumping of a rival service academy of note. But a promotion by the school’s athletics-marketing arm has earned national attention in recent days: Fans who beat the school mascot, Bill the Goat, at rock-paper-scissors before a Feb. 5 men’s basketball game against Boston University will earn free admission. Tipoff is set for 7 p.m. Fans can throw hands with the mascot from 6:15 to 6:45 for the chance to win a…