The peak theatrical pleasure to be had in Richmond is back: summer Shakespeare at Agecroft Hall. It’s a happy mystery how hot, humid days can switch to cool evenings just as the Elizabethan verse gets going, but it seems to happen every time. This season’s opener is “Henry V,“ the culmination of three years pursuing the Henry cycle. James Alexander Bond has directed all three plays, and Phillip James Brown has played the younger Henry throughout, granting audiences a marvelous artistic continuity.