.NET: Fix expensive logging

dotnet/src/Microsoft.Agents.AI.Hosting/HostedWorkflowState.cs

@@ -364,9 +364,7 @@ private void UpdateCursor(string sessionId, CheckpointInfo? checkpoint)
     private void WarnOnNoProgress(string sessionId)
         // The resumed turn drove no work: the checkpoint may be stale or the input may not match the workflow's
         // expected type, so the session's state may not have progressed.
-        => this._logger.LogWarning(
-            "Resuming workflow session '{SessionId}' produced no events; the checkpoint may be stale or the input may not match the workflow's expected input type. Session state may not have progressed.",
-            sessionId);
+        => this._logger.LogWorkflowResumeMadeNoProgress(sessionId);
 
     /// <summary>
     /// Gets the recorded head checkpoint for <paramref name="sessionId"/>, if any.
@@ -383,3 +381,12 @@ internal bool TryGetCheckpoint(string sessionId, out CheckpointInfo? checkpoint)
         return this._cursor.TryGetValue(sessionId, out checkpoint);
     }
 }
+
+[System.Diagnostics.CodeAnalysis.ExcludeFromCodeCoverage]
+internal static partial class HostedWorkflowStateLogMessages
+{
+    [LoggerMessage(
+        Level = LogLevel.Warning,
+        Message = "Resuming workflow session '{SessionId}' produced no events; the checkpoint may be stale or the input may not match the workflow's expected input type. Session state may not have progressed.")]
+    public static partial void LogWorkflowResumeMadeNoProgress(this ILogger logger, string sessionId);
+}