Add 6 tests covering: - Config struct zero value defaults - NewUpdater with InsecureSkipVerify option - NewUpdater with Disabled option - determineArch format validation - verifyBinaryMagic on directories - Package constants validation
- Test binary magic verification (ELF, PE, Mach-O) - Test architecture detection - Test Unraid persistent path generation - Test updater configuration defaults - Test edge cases: empty files, too short, non-existent