[Md-Talim]

Closes #1454

Summary

JobSnooze previously validated negative durations, but the validation was lost when the function was moved into error.go during the job-executor refactor. This restores the documented behavior and adds public-API regression coverage.

Changes

• Restore the panic for negative durations, preserving the original panic message.
• Add regression tests for negative durations.
• Verify that zero and positive durations remain valid.

Testing

• go test . -run '^TestJobSnooze' -count=1 -v
• go test . -run '^TestJobSnooze$' -count=1

The focused tests pass.

[brandur]

Thanks! Do you want to throw a changelog entry in there too?

[Md-Talim]

Added a changelog entry under Unreleased. Fixed and addressed the lint error. Thanks!