Summary

.golangci.yml currently disables errcheck warnings for most fmt/os functions:

errcheck:
  exclude-functions:
    - fmt.Fprint
    - fmt.Fprintf
    - fmt.Fprintln
    - fmt.Print
    - fmt.Printf
    - fmt.Println
    - os.Setenv
    - os.Unsetenv

With these exclusions, errcheck rarely reports ignored errors. Only a handful of UI-friendly prints need special handling.

Desired outcome

• Remove the blanket errcheck exclusions.
• Update call sites to explicitly handle or ignore returned errors.
• Keep errcheck effective so real issues are surfaced.

Notes

• Most print helpers target os.Stdout/os.Stderr; assigning to _ or wrapping helpers should be enough.
• This is lint/code-cleanup only; no CLI behaviour changes are expected.