Fix CI tests by setting Turso env vars

- Add TURSO_DATABASE_URL/TURSO_AUTH_TOKEN to CI workflow
- Update outdated valTownAdapter comment in db.ts

.github/workflows/test.yml

···
         run: deno lint
       - name: Run tests
         run: deno task test
+        env:
+          # Use remote Turso client in CI (avoids local file creation)
+          # Tests use MemoryStorage, so no actual DB connection needed
+          TURSO_DATABASE_URL: libsql://test.turso.io
+          TURSO_AUTH_TOKEN: test-token

backend/database/db.ts

···
   authToken: Deno.env.get("TURSO_AUTH_TOKEN"),
 });
 
-// Wrap the client to match the ExecutableDriver interface expected by valTownAdapter
-// The libSQL client returns Row objects, but valTownAdapter expects { rows: unknown[][] }
+// Wrap the client to provide a consistent interface
+// The libSQL client returns Row objects, we convert to arrays for compatibility
 export const rawDb = {
   execute: async (
     query: { sql: string; args: unknown[] },