feat: support long text and safe attachment batches

node-agent/WxAgent.Service/RemoteAgentHostedService.cs

@@ -841,7 +841,7 @@ public sealed class RemoteAgentHostedService(
         JsonElement Content,
         IReadOnlyList<RemoteReportingScope> ChatScopes);
 
-    private static async Task ReplayUnreportedResultsAsync(
+    private async Task ReplayUnreportedResultsAsync(
         RemoteControlClient client,
         RemoteTaskLedger ledger,
         ReportingConfig reporting,
@@ -851,7 +851,7 @@ public sealed class RemoteAgentHostedService(
             await ReportResultAsync(client, ledger, pending.Result, reporting, cancellationToken, pending.ReportingScopes);
     }
 
-    private static async Task ReportResultAsync(
+    private async Task ReportResultAsync(
         RemoteControlClient client,
         RemoteTaskLedger ledger,
         RemoteTaskResult result,
@@ -859,8 +859,16 @@ public sealed class RemoteAgentHostedService(
         CancellationToken cancellationToken,
         IReadOnlyList<RemoteReportingScope>? chatScopes = null)
     {
-        await client.SendTaskResultAsync(result, reporting, chatScopes: chatScopes, cancellationToken: cancellationToken);
-        ledger.MarkReported(result.TaskId);
+        try
+        {
+            await client.SendTaskResultAsync(result, reporting, chatScopes: chatScopes, cancellationToken: cancellationToken);
+            ledger.MarkReported(result.TaskId);
+        }
+        catch (RemoteClientException exception) when (exception.StatusCode == 404 && exception.Code == "TaskNotFound")
+        {
+            ledger.MarkResultTaskNotFound(result.TaskId);
+            logger.LogWarning("Remote task result no longer exists on the control plane; result retained locally and will not be retried.");
+        }
     }
 
     private async Task<BackendSnapshot> ReadSnapshotAsync(RemoteAgentOptions remote, CancellationToken cancellationToken)
@@ -972,8 +980,16 @@ public sealed class RemoteAgentHostedService(
             || confirmed.ValueKind != JsonValueKind.True)
             return false;
         targetId = target.GetString() ?? "";
-        text = content.GetString() ?? "";
-        return targetId.Length is > 0 and <= 512 && text.Length is > 0 and <= 4000;
+        if (targetId.Length is 0 or > 512) return false;
+        try
+        {
+            text = WechatTextInput.PrepareLongText(content.GetString() ?? "");
+            return true;
+        }
+        catch (WxAgentException)
+        {
+            return false;
+        }
     }
 
     private static bool GetBoolean(JsonElement value, string propertyName) =>