(chore) add pull mode error

lib/pullmode/errors.go

@@ -0,0 +1,39 @@
+/*
+Copyright 2026. projectsveltos.io. All rights reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package pullmode
+
+import (
+	libsveltosv1beta1 "github.com/projectsveltos/libsveltos/api/v1beta1"
+)
+
+type AgentHeartbeatTimeoutError struct {
+}
+
+func (e *AgentHeartbeatTimeoutError) Error() string {
+	return "AgentLastReportTime is older than max allowed age"
+}
+
+// IsAgentTimeoutError checks if the SveltosCluster failure message matches AgentTimeoutError
+func IsAgentTimeoutError(sveltosCluster *libsveltosv1beta1.SveltosCluster) bool {
+	if sveltosCluster.Status.FailureMessage == nil {
+		return false
+	}
+
+	// Create an instance of the error to get the authoritative message
+	err := &AgentHeartbeatTimeoutError{}
+	return *sveltosCluster.Status.FailureMessage == err.Error()
+}