Add Client interface with PutObject, GetObject, RemoveObject, PresignedGetObject, and HandleError; Component now embeds Client with Native() as escape hatch for operations not covered by the interface. Add xerrors dependency: HandleError maps minio-go error codes to portable typed codes (NoSuchKey → ErrNotFound, AccessDenied → ErrPermissionDenied, BucketAlreadyExists → ErrAlreadyExists, etc.). OnStop sets c.mc = nil for lifecycle consistency. doc.go updated with launcher wiring, upload, presigned URL, GetObject, and HandleError usage examples. API committed as stable. What's included: - Config with Endpoint, AccessKey, SecretKey, UseSSL, Bucket, Region (env-driven, embeddable) - Transport field in Config for test injection (env:"-", nil uses minio-go default) - Client interface: PutObject, GetObject, RemoveObject, PresignedGetObject, HandleError - Component interface: launcher.Component + health.Checkable + Client + Native() - New(logger, cfg) constructor for lifecycle registration via lc.Append - Automatic bucket creation on OnStart if bucket does not exist - Health check via BucketExists at LevelCritical priority - HandleError: maps minio-go ErrorResponse codes to xerrors typed errors - 21 unit tests using mock HTTP transport; no live server required
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