- Add RbxError base class with AuthError, RateLimitError, UploadError,
and AssetNotFoundError subclasses
- Add BatchUploadItem and BatchResult dataclasses
- Add batch_upload method with semaphore-limited concurrency (2 at a time)
- Add configurable max_attempts and poll_interval to upload_clothing_image
- Add CLI with upload and onsale commands (rbx-upload[cli] extra)
- Improve auth error handling across all client methods
- Bump version to 0.2.0
ivy