WASHINGTON — The Pentagon has created a “war room” to ramp up production of hypersonic weapons from a handful of prototypes over the last decade to “hundreds of weapons” in the near future, a senior official said Wednesday. Those weapons will range from huge rocket-powered boost-glide missiles, fired from Army trucks and Navy submarines at more than Mach 10, to more compact and affordable air-breathing cruise missiles, fired from aircraft at a relatively modest Mach 5-plus.