v0.3.6

Added

• goqueue.Permanent(err) (also job.Permanent) marks a job error as non-retryable, and goqueue.IsPermanent(err) detects the mark. When a handler returns a permanent error (also when wrapped again with %w), the worker skips the remaining retries and dead-letters the job at once instead of retrying a request that cannot succeed, such as one an API rejected with a 4xx. The DLQ entry keeps the original error chain. Permanent(nil) is nil.