v3.42.33: Add cenkalti/backoff for exponential backoff retry
- Exponential backoff retry for all cloud operations (S3, Azure, GCS) - RetryConfig presets: Default (5x), Aggressive (10x), Quick (3x) - Smart error classification: IsPermanentError, IsRetryableError - Automatic file position reset on upload retry - Retry logging with wait duration - Multipart uploads use aggressive retry (more tolerance)
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