Add new hasHeartbeatDetails property to Activity Info

Author: bauer-andreas

Sources/Temporal/Worker/Activities/ActivityExecutionContext.swift

@@ -119,6 +119,15 @@ public struct ActivityExecutionContext: Sendable {
         /// The data converter used for payload serialization.
         private let dataConverter: DataConverter
 
+        /// Determine if the activity execution has heartbeat details from a previous activity attempt available.
+        ///
+        /// Heartbeat details are preserved across activity retries, allowing activities to resume execution
+        /// from a known checkpoint. If the activity info carries heartbeat details from a previous activity attempt,
+        /// this property will return true.
+        public var hasHeartbeatDetails: Bool {
+            !self.heartbeatDetails.isEmpty
+        }
+
         /// Creates a new activity information instance.
         ///
         /// - Parameters: