[P3] Repository contains Go files that are not gofmt-formatted

[jdevera]

Summary

gofmt -l . reports tracked source files.

Files

• cmd/root.go
• internal/helper/exec-cmd.go
• internal/repository/default-repo-index.go
• internal/updater/self-updater.go
• internal/user/user.go

Impact

Formatting drift creates noisy diffs and makes style enforcement inconsistent across contributors and CI.

Suggested correction

Run gofmt on the listed files and add a CI check that fails when gofmt -l returns output.

Acceptance criteria

• gofmt -l . produces no output.
• CI enforces the same check on future changes.