How I built an AI Dungeon Master that actually remembers what you did three sessions ago

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## The demo moment

Player types: "I push open the door of The Salt Lantern and step inside, shaking the rain off my cloak. I scan the room for Bren."

The AI Dungeon Master narrates back a paragraph in which the barkeep Bren shoots them a wary look — because in Session 3, the party sold his brother Aldric out to Captain Vell. In the corner, Mirek the Hawk silently watches — because in Session 2, the party quietly paid Joren's 80-gold gambling debt to him. On the wall, a wanted poster shows a scar shaped like the one on Kara's cheek — the rogue who stole the Amulet of Vohr in Session 1.

Three canon threads. One player action. Zero canon written into the narration prompt.