Apply gofmt fixes

[marcus]

Summary

• run the repository formatter (make fmt, which applies gofmt -w .) across the current Go formatter failure set
• keep the change scoped to formatter-only style cleanup already detected by gofmt -l .
• validate against the repo's existing quality checks

Validation

• go vet ./... ✅
• go build ./... ✅
• go test ./... ⚠️ fails in internal/features:
  • TestKnownFeatureDefaults
  • TestIsEnabledForProcess_EnableDisableLists
  • TestIsEnabled_ProjectConfigAndEnvPrecedence

This task was intentionally scoped to the repo's existing lint/style enforcement: gofmt plus the current pre-commit Go checks, without introducing a new linter.