FULL INTERVIEW: Jen Kha says El Salvador gave every school free Grok and is deploying AI doctors. She says countries nobody expects are now outpacing America on adoption while America fights over data centers. @jkhamehl is a managing partner and head of global partnerships at @a16z. She joined @theojaffee and @sophiadew on announcement day for the $1.1B Machine Age Fund to walk through the thesis and break down why the physical layer under AI was uninvestable for 30 years and isn't…