fix(release): harden v1.31 arrival contracts

src/app/api/documents/inbound/__tests__/route.test.ts

@@ -11,7 +11,7 @@ import { beforeEach, describe, expect, it, vi } from "vitest";
  * query NEVER selects the encrypted blob column.
  */
 
-process.env.ENCRYPTION_KEY ??=
+process.env.ENCRYPTION_KEY =
   "0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef";
 
 const { txQueryRaw, txCreate, txCreateMany } = vi.hoisted(() => ({