feat: support long text and safe attachment batches

node-agent/WxAgent.Service/AgentService.cs

@@ -138,7 +138,9 @@ public sealed class AgentService(IAgentBackend backend, ServiceSecurity security
     {
         var kind = RequireText(request.Kind, "kind", 80);
         var accountId = RequireText(request.AccountId, "accountId", 200);
-        var text = PrepareText(request.Text);
+        var text = string.Equals(kind, "send-text", StringComparison.Ordinal)
+            ? PrepareLongText(request.Text)
+            : PrepareText(request.Text);
         var idempotencyKey = RequireText(request.IdempotencyKey, "idempotencyKey", 128);
         if (!request.Confirmed) throw new ServiceException("ConfirmationRequired", 409, "Explicit send confirmation is required.");
 
@@ -271,6 +273,12 @@ public sealed class AgentService(IAgentBackend backend, ServiceSecurity security
         return value;
     }
 
+    private static string PrepareLongText(string? value)
+    {
+        try { return WechatTextInput.PrepareLongText(value ?? string.Empty); }
+        catch (WxAgentException exception) { throw new ServiceException("InvalidRequest", 400, exception.Message); }
+    }
+
     private static string PrepareText(string? value)
     {
         try { return WechatTextInput.Prepare(value ?? string.Empty); }

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) =>

node-agent/WxAgent.Service/wwwroot/index.html

@@ -50,7 +50,7 @@
         <label class="toggle"><input id="content" type="checkbox"> 显示正文 <span class="muted">需要 content 权限</span></label>
       </section>
       <section class="panel"><div class="section-heading"><h2>会话</h2><span class="muted">当前账号</span></div><div id="sessions" class="list"></div></section>
-      <section class="panel reply-panel"><div class="section-heading"><h2>回复</h2><span id="replyCapability" class="muted">发送能力检查中…</span></div><div class="reply-form"><label for="replyTarget">目标会话</label><select id="replyTarget"><option value="">先选择会话</option></select><label for="replyText">文本</label><textarea id="replyText" rows="4" maxlength="4000" placeholder="输入要发送的文本" disabled></textarea><div class="reply-actions"><button id="sendReply" disabled>发送</button><span id="replyState" class="muted">写能力尚未开放。</span></div></div></section>
+      <section class="panel reply-panel"><div class="section-heading"><h2>回复</h2><span id="replyCapability" class="muted">发送能力检查中…</span></div><div class="reply-form"><label for="replyTarget">目标会话</label><select id="replyTarget"><option value="">先选择会话</option></select><label for="replyText">文本</label><textarea id="replyText" rows="4" maxlength="20000" placeholder="输入要发送的文本" disabled></textarea><div class="reply-actions"><button id="sendReply" disabled>发送</button><span id="replyState" class="muted">写能力尚未开放。</span></div></div></section>
       <section class="panel"><div class="section-heading"><h2>可见消息</h2><span class="muted">只显示当前可读取的数据</span></div><div id="messages" class="list"></div></section>
     </section>