fix(tests): resolve flaky ID generation and symlink resolution on macOS

internal/agentupdate/update_test.go

@@ -369,8 +369,14 @@ func TestSymlinkResolution(t *testing.T) {
 		t.Fatalf("EvalSymlinks failed: %v", err)
 	}
 
-	if resolved != realFile {
-		t.Errorf("EvalSymlinks(%q) = %q, want %q", linkFile, resolved, realFile)
+	// Normalize realFile in case tmpDir itself contains symlinks (e.g. /var -> /private/var on macOS)
+	realFileResolved, err := filepath.EvalSymlinks(realFile)
+	if err != nil {
+		t.Fatalf("EvalSymlinks on realFile failed: %v", err)
+	}
+
+	if resolved != realFileResolved {
+		t.Errorf("EvalSymlinks(%q) = %q, want %q", linkFile, resolved, realFileResolved)
 	}
 
 	// Verify temp file in same dir as resolved path allows rename

internal/utils/helpers.go

@@ -6,12 +6,13 @@ import (
 	"net/http"
 	"os"
 	"strings"
-	"time"
+
+	"github.com/google/uuid"
 )
 
 // GenerateID generates a unique ID with the given prefix
 func GenerateID(prefix string) string {
-	return fmt.Sprintf("%s-%d", prefix, time.Now().UnixNano())
+	return fmt.Sprintf("%s-%s", prefix, uuid.NewString())
 }
 
 // WriteJSONResponse writes a JSON response to the http.ResponseWriter