Address PR Comments

Author: ginaxu1

internal/config/config.go

@@ -178,11 +178,8 @@ func GetEnvOrDefault(key, defaultValue string) string {
 
 // mergeUniqueStrings merges two string slices and removes duplicates
 func mergeUniqueStrings(a, b []string) []string {
-	if len(a) == 0 {
-		return append([]string(nil), b...)
-	}
-	seen := make(map[string]struct{})
-	var result []string
+	seen := make(map[string]struct{}, len(a)+len(b))
+	result := make([]string, 0, len(a)+len(b))
 
 	for _, s := range a {
 		if _, ok := seen[s]; !ok {

pkg/audit/interface.go

@@ -5,7 +5,14 @@ import (
 	"crypto"
 )
 
-// Auditor is the primary interface for audit logging operations
+// Auditor is the primary interface for audit logging operations.
+// This interface provides a clean abstraction for audit capabilities,
+// making it easy to swap implementations and integrate audit logging into any service.
+//
+// Implementations should handle:
+// - Asynchronous logging (fire-and-forget)
+// - Graceful degradation when the audit service is unavailable
+// - Thread-safe operations
 type Auditor interface {
 	// LogEvent logs a standard audit event asynchronously
 	LogEvent(ctx context.Context, event *AuditLogRequest)
@@ -23,6 +30,6 @@ type Auditor interface {
 	IsEnabled() bool
 }
 
-// AuditClient is an alias for Auditor to maintain backward compatibility
+// AuditClient is an alias for Auditor to maintain backward compatibility.
 // Deprecated: Use Auditor instead. This will be removed in a future version.
 type AuditClient = Auditor

pkg/audit/security_test.go

@@ -93,12 +93,21 @@ func TestSignAndVerify_Ed25519(t *testing.T) {
 }
 
 func TestVerifyPayload_Mismatch(t *testing.T) {
-	privateKey, _ := rsa.GenerateKey(rand.Reader, 2048)
+	privateKey, err := rsa.GenerateKey(rand.Reader, 2048)
+	if err != nil {
+		t.Fatalf("failed to generate RSA key: %v", err)
+	}
 	payload := []byte(`{"event":"test"}`)
-	sigBase64, alg, _ := SignPayload(payload, privateKey)
+	sigBase64, alg, err := SignPayload(payload, privateKey)
+	if err != nil {
+		t.Fatalf("signing failed: %v", err)
+	}
 
-	privateKey2, _ := rsa.GenerateKey(rand.Reader, 2048)
-	err := VerifyPayload(payload, sigBase64, alg, &privateKey2.PublicKey)
+	privateKey2, err := rsa.GenerateKey(rand.Reader, 2048)
+	if err != nil {
+		t.Fatalf("failed to generate second RSA key: %v", err)
+	}
+	err = VerifyPayload(payload, sigBase64, alg, &privateKey2.PublicKey)
 	if err == nil {
 		t.Errorf("expected verification to fail with wrong key")
 	}