The six technologies that feed the Granary are Exogamy, Literacy, The Scroll, Epic Poetry, Agriculture, and Plant-Based Ink. The relevant puzzle answers therefore are:
GOOIER AIRBAG ORCHID AUTUMN INGRID UPKEEP
Write each of the six-letter answers in two vertical columns, as shown on the sample cuneiform tablet. However, as the flavortext suggests, write only the vowels, so you get the following:
.i a. o. au i. ue oe ia .i u. .i .e o. .. .. .. .. ..
Read as Braille, this spells THE FED, which is the metapuzzle answer.