Ignore Codex attachment artifacts

- Add the remote attachment cache directory to gitignore
- Prevent screenshot artifacts from appearing as untracked files

🤖 Auto-generated

Author: OwenMcGirr

.gitignore

@@ -14,6 +14,7 @@
 bin/
 gen/
 out/
+.codex-remote-attachments/
 #  Uncomment the following line in case you need and you don't have the release build type files in your app
 # release/