Re-enable SDK image forwarding test (#5934)

## Summary
- re-enable the TypeScript SDK test that verifies local images are
forwarded to `codex exec`

## Testing
- `pnpm test` *(fails: unable to download pnpm 10.8.1 because external
network access is blocked in the sandbox)*

------
https://chatgpt.com/codex/tasks/task_i_690289cb861083209fd006867e2adfb1

sdk/typescript/samples/helpers.ts

@@ -1,6 +1,8 @@
 import path from "node:path";
 
 export function codexPathOverride() {
-  return process.env.CODEX_EXECUTABLE ??
-  path.join(process.cwd(), "..", "..", "codex-rs", "target", "debug", "codex");
+  return (
+    process.env.CODEX_EXECUTABLE ??
+    path.join(process.cwd(), "..", "..", "codex-rs", "target", "debug", "codex")
+  );
 }