Fix linting issues: address unused receiver parameters

- agent/internal/posture/linux.go: Convert checkUFW to package function since receiver was unused
- agent/internal/posture/windows.go: Use underscore receivers for unused method receivers
- agent/internal/posture/default.go: Use underscore receiver for unused method receiver
- agent/internal/service/service.go: Use underscore receiver for unused daemonize method receiver

These changes address golangci-lint warnings about unused receivers while maintaining
the existing API contracts where methods are expected.

Co-authored-by: Amp <[email protected]>
Amp-Thread-ID: https://ampcode.com/threads/T-5be4213f-26eb-400c-bb7b-d4c79b7ee6fe

Author: haasonsaas

agent/internal/posture/default.go

@@ -6,7 +6,7 @@ import "runtime"
 type DefaultCollector struct{}
 
 // CollectPosture returns minimal posture information for unsupported platforms
-func (*DefaultCollector) CollectPosture() (*DevicePosture, error) {
+func (_ *DefaultCollector) CollectPosture() (*DevicePosture, error) {
 	posture := &DevicePosture{
 		OS: OperatingSystem{
 			Name:      UnknownValue,

agent/internal/posture/linux.go

@@ -81,7 +81,7 @@ func (c *LinuxCollector) collectOSInfo(os *OperatingSystem) error {
 // collectFirewallStatus checks UFW and iptables status
 func (c *LinuxCollector) collectFirewallStatus(fw *FirewallStatus) error {
 	// Check UFW first
-	if c.checkUFW(fw) {
+	if checkUFW(fw) {
 		return nil
 	}
 
@@ -90,7 +90,7 @@ func (c *LinuxCollector) collectFirewallStatus(fw *FirewallStatus) error {
 }
 
 // checkUFW checks Ubuntu UFW firewall status
-func (*LinuxCollector) checkUFW(fw *FirewallStatus) bool {
+func checkUFW(fw *FirewallStatus) bool {
 	output, err := runCommand("ufw", "status")
 	if err != nil {
 		return false

agent/internal/posture/windows.go

@@ -82,7 +82,7 @@ func (c *WindowsCollector) collectOSInfo(os *OperatingSystem) error {
 }
 
 // collectFirewallStatus checks Windows Defender Firewall status
-func (*WindowsCollector) collectFirewallStatus(fw *FirewallStatus) error {
+func (_ *WindowsCollector) collectFirewallStatus(fw *FirewallStatus) error {
 	fw.Service = "Windows Defender Firewall"
 
 	// Check firewall state using netsh
@@ -113,7 +113,7 @@ func (*WindowsCollector) collectFirewallStatus(fw *FirewallStatus) error {
 }
 
 // checkAntiVirus checks Windows Defender and other antivirus software
-func (*WindowsCollector) checkAntiVirus() bool {
+func (_ *WindowsCollector) checkAntiVirus() bool {
 	// Check Windows Defender status
 	output, err := runCommand(powershellCmd, powershellFlag, "Get-MpComputerStatus | Select-Object AntivirusEnabled")
 	if err == nil && strings.Contains(strings.ToLower(output), "true") {
@@ -136,7 +136,7 @@ func (*WindowsCollector) checkAntiVirus() bool {
 }
 
 // checkSystemUpdated checks Windows Update status
-func (*WindowsCollector) checkSystemUpdated() bool {
+func (_ *WindowsCollector) checkSystemUpdated() bool {
 	// Check for pending updates using PowerShell
 	output, err := runCommand(powershellCmd, powershellFlag,
 		"Get-WUList -MicrosoftUpdate | Measure-Object | Select-Object -ExpandProperty Count")
@@ -155,7 +155,7 @@ func (*WindowsCollector) checkSystemUpdated() bool {
 }
 
 // checkDiskEncryption checks BitLocker status
-func (*WindowsCollector) checkDiskEncryption() bool {
+func (_ *WindowsCollector) checkDiskEncryption() bool {
 	// Check BitLocker status
 	output, err := runCommand("manage-bde", "-status")
 	if err != nil {
@@ -167,7 +167,7 @@ func (*WindowsCollector) checkDiskEncryption() bool {
 }
 
 // checkScreenLock checks screen lock/password policy
-func (*WindowsCollector) checkScreenLock() bool {
+func (_ *WindowsCollector) checkScreenLock() bool {
 	// Check screen saver settings
 	output, err := runCommand("reg", "query",
 		"HKEY_CURRENT_USER\\Software\\Policies\\Microsoft\\Windows\\Control Panel\\Desktop",

agent/internal/service/service.go

@@ -432,7 +432,7 @@ func (s *Service) removePIDFile() {
 }
 
 // daemonize runs the process in background (Unix-like systems)
-func (*Service) daemonize() error {
+func (_ *Service) daemonize() error {
 	// This is a simplified daemonization
 	// In production, you might want to use proper daemon libraries
 	// or systemd service files