golangci-lint flagged three errcheck:
- stream_token.go: fmt.Fprintf(mac, ...) - hash.Hash never errors
per documented contract, but errcheck wants explicit discard.
Discard via _, _ assignment with a WHY comment.
- config_test.go: os.Unsetenv calls in tests - discard the error
via _ assignment. Test cleanup paths.
Reviewers flagged the Fprintf one during Task 1 quality review but
golangci-lint runs in a separate CI step that wasn't exercised on
the per-task pushes (cancelled by subsequent push concurrency).
bvandeusen
c3614c6333