fix(antigravity): mask project_id in logs

sdk/auth/antigravity.go

@@ -180,7 +180,7 @@ waitForCallback:
 			return nil, fmt.Errorf("antigravity: failed to fetch project ID: %w", errProject)
 		} else {
 			projectID = fetchedProjectID
-			log.Infof("antigravity: obtained project ID %s", projectID)
+			log.Infof("antigravity: obtained project ID %s", util.HideAPIKey(projectID))
 		}
 	}
 	if strings.TrimSpace(projectID) == "" {
@@ -211,7 +211,7 @@ waitForCallback:
 
 	fmt.Println("Antigravity authentication successful")
 	if projectID != "" {
-		fmt.Printf("Using GCP project: %s\n", projectID)
+		fmt.Printf("Using GCP project: %s\n", util.HideAPIKey(projectID))
 	}
 	return &coreauth.Auth{
 		ID:       fileName,