fix(auth): persist signup verification sessions and supply delivery URLs

packages/auth/src/index.ts

@@ -1,4 +1,10 @@
 export { createAuthEngine, type AuthEngine } from "./engine.ts";
+export {
+  startVerificationSession,
+  getVerificationUser,
+  clearVerificationSession,
+  VERIFICATION_SESSION_COOKIE,
+} from "./verification-session.ts";
 export type { AuthStore } from "./store.ts";
 export { MemoryAuthStore } from "./stores/memory.ts";
 export { SqlAuthStore } from "./stores/sql.ts";