export Keys so packages can add their own local types

packages/shared/src/kv.ts

@@ -3,7 +3,7 @@ import { dirname, join } from "node:path"
 import type { Reminder } from "@/reminders"
 
 export type Conversation = { message: string; role: "user" | "assistant" }
-type Keys = {
+export interface Keys {
   threads: Record<string, string> // threadId: previousResponseId
   reminders: Reminder[]
 }