v0.4.1

Agent

Added

• AddedSFTP storage backend, planned and built across forty-nine scenarios. OpenSSH + SFTP on the integration path, sat behind the same StorageBackend interface the S3 path uses.
• AddedUpload / Download / Delete / List / ResumeUpload on SFTP, with the same crash-resume receipt the S3 path uses.

Changed

• ChangedConfigProvider rejects S3 and SFTP destinations missing required fields up front, instead of failing partway through a job.